An artist's impression for this article: a quantum wave rippling through sacred geometry. Click to enlarge.

What Is Matter Made Of? Quran and Quantum Physics

Written by Mohammad Aamir • 6 September 2026 • 20 minutes • Sources at the end

The short version. You touch a table and it feels solid. But it is not really solid at all. Scientists have known for a century that matter is almost entirely empty space. And for half a century they have known something even stranger: the deepest layer of reality is not tiny solid balls, but invisible fields that fill every corner of the universe. In this article I walk through that science in plain English, step by step, and then place it next to four verses of the Quran about the unseen, the measure of all things, and the short-lived nature of worldly life. I don't claim any of it as proof. Every number and date has its source listed at the end, so you can check each step yourself.

What's inside

1. Where we begin
2. One universe, two rule books
3. The story in six moments
4. The atom you learned at school is wrong
5. You have never truly touched anything
6. All of humanity in a sugar cube
7. The hidden ocean: quantum fields
8. Why anything feels solid
9. What holds it all together
10. Not a proof, an invitation
11. Questions people often ask
12. Test yourself
13. What I took away
14. If you want to dig deeper

1Where we begin

Start with a thought experiment. Throw a tennis ball at a brick wall and it bounces back, exactly as you would expect. Now imagine it sailing straight through the wall. Or sitting on both sides of the wall at the same time. In daily life that is magic. In the quantum world, it is perfectly normal.

That is the world this article is about, and it leads to one of the biggest questions you can ask: what is reality actually made of? And does modern physics give the Quran's old words about the unseen a new meaning?

I want to make one thing clear from the start. I will keep two things separate the whole way. First, the science: what physicists have actually measured, with dates and names. Second, the reflection: what it might mean for faith. The science is checkable. The reflection is personal. Mixing them up helps nobody.

I am no scientist, just a curious writer, so where I state a number or a date, the source sits at the end of the article. You can check it all.

Four numbers to start with, so you know what's coming:

Scale
63,000× A nucleus is this much smaller than its atom. Keep that in mind.

Mass
Over 99.95% of an atom's mass sits in that tiny nucleus.

People
2.2 cm³ All eight billion of us, with the empty space removed.

Precision
1 in a trillion How closely our best theory matches measurement.

The rest of this piece in six stops, if you'd like to jump around:

Two rule booksThe universe runs on one set of rules upstairs and a completely different one downstairs.

The empty atomWhat Rutherford saw when he looked inside gold foil in 1911.

Quantum fieldsThe electron isn't a ball. It's a ripple in an invisible ocean.

Why matter feels solidTwo forces pretend to be a table: electromagnetism and Pauli's rule.

The four versesAl-Ghayb, Qadar, Mata' al-Ghurur, and the One who holds the sky.

The honest boundaryReflection, not proof. I'll say why.

2One universe, two rule books

1

How small are we talking?

First, a sense of scale. Line up several hundred thousand atoms side by side and they would be as wide as a single hair on your head. That is how small an atom is. And the quantum world is the world inside the atom, smaller still.

Up here, in the world of tables and planets, one rule book governs everything. Gravity keeps you on the ground. Apples fall. Planets circle the Sun on steady paths. Newton's world feels natural because it is the world we live in every day.

But go down past the atom, and the rule book changes completely.

2

Waves that make stripes

Drop two stones into a still pond at the same time. Each stone makes rings. Where the rings meet, they mix. In some places the water jumps higher; in other places it goes flat. That mixing of waves has a name: interference. It is what waves do.

Light does it too. Back in 1801, Thomas Young, an English scientist, shone light through two narrow slits and saw stripes on the wall behind: bright lines and dark lines, side by side, like the rings on the pond. Light, he concluded, travels as a wave19.

Now the strange part. In the twentieth century, scientists tried the same experiment with electrons, the tiny particles inside every atom. You would expect a particle to fly through one slit or the other and leave two marks. That is not what happens. Send the electrons through one at a time, and each one lands as a single dot. But wait, and the dots slowly build up into stripes. Stripes! Exactly the pattern a wave would make, as if each single electron had gone through both slits at once and mixed with itself.

Merli, Missiroli and Pozzi first showed this with single electrons in 1976, and Akira Tonomura's team in Japan produced the famous build-up pictures in 198956. Physics World readers later voted it the most beautiful experiment in physics6.

Fig. 1 · Artist's impression. Single dots, arriving one at a time, building a pattern that only a wave could draw (ref 5)(6). Not experimental data.

One honest note: nobody has ever seen a particle in two places at once. What we see is the pattern. The particle acts like a wave until you check where it is, and then it acts like a dot again. The tennis-ball picture is a good way in, but it isn't the full story.

3

Walking through walls, and a limit on knowing

Two more quantum surprises, quickly.

First: particles can pass through barriers they should not be able to cross. Scientists call it tunnelling. George Gamow worked out the maths in 1928, and two other scientists, Gurney and Condon, reached the same answer on their own7. Tunnelling is why the Sun shines at a temperature the old physics said was too cool. It is also at work every time your phone saves a photo. That quantum trick happens inside your phone.

Second: nature puts a limit on what we can know. In 1927, Werner Heisenberg showed that you cannot know both where a particle is and how fast it is moving, not just because our tools are not good enough, but because that is how nature is built18. The more exactly you measure one, the blurrier the other becomes. Physicists call it the uncertainty principle. It sounds like a small thing. It changes the whole picture.

3The story in six moments

Before we go deeper, let me put the whole century of discovery into six moments. I find it helps to keep the timeline in mind.

1911Rutherford finds the nucleus. The atom turns out to be almost entirely empty space.

1925Pauli proposes his exclusion rule. No two electrons may sit in the same state. Matter gets its size.

1927Heisenberg publishes his uncertainty principle. You can never fully know both at once.

1928Gamow explains tunnelling. Particles walk through walls, and the Sun makes sense.

1940sFeynman, Schwinger and Tomonaga refine quantum field theory. It wins the 1965 Nobel Prize.

1989Tonomura's team photographs single electrons building stripes, one dot at a time.

One discovery built on the last. That is how science moves: step by step, each step standing on the one before.

4The atom you learned at school is wrong

4

Almost all of it is empty space

School taught us a tidy picture: a solid nucleus with electrons orbiting like planets, a tiny solar system. It is a lovely picture, and it is wrong.

Bohr's model was only a first step. Quantum mechanics replaced neat orbits with orbitals: hazy clouds of chance, showing where the electron is likely to be, with no definite path at all9. Think of a moth circling a lamp on a summer evening. You see the blur of where it goes, not the insect at one spot. The electron's orbital is a bit like that blur.

The man who opened the door was Ernest Rutherford. In Manchester, between 1908 and 1911, his colleagues Geiger and Marsden fired alpha particles, tiny specks from radioactive material, at gold foil so thin it was nearly gone. Most flew straight through. But a tiny few bounced right back. Rutherford said it was like firing a bullet at a sheet of tissue paper and having the bullet bounce back at you. Amazed, he worked out why: all the atom's positive charge and nearly all its mass must be packed into a nucleus far smaller than the atom itself12. As far as anyone can measure, the rest is empty.

The football and the stadium, done properly

Scale the hydrogen atom so the nucleus becomes a football. The maths behind that picture:

proton radius  ≈ 0.84 fm = 0.84 × 10⁻¹⁵ m
hydrogen atom  ≈ 53 pm = 53 × 10⁻¹² m (the Bohr radius)
ratio  = 53 × 10⁻¹² ÷ 0.84 × 10⁻¹⁵ ≈ 63,000

football ≈ 22 cm across  →  22 cm × 63,000 ≈ 13.9 km

Park the football at the centre of a stadium, and the electron's cloud begins kilometres away. You can say it the other way round too: shrink the whole atom down to a stadium, and the nucleus becomes a grain of sand at the middle. And the electron itself? As far as any experiment can tell, it has no size at all16.

Fig. 2 · Artist's impression. The nucleus here is drawn far larger than to scale; in reality the gap is greater still (ref 1).

A small extra fact I love: what makes one element different from another is simply the number of protons in the nucleus. One proton, hydrogen. Two, helium. Seventy-nine, gold. The famous periodic table is just a numbered list.

5You have never truly touched anything

5

A cushion of invisible fields

Keep this picture in mind: press your fingers on the table. What stops them isn't the table. It's the table's electron cloud pushing back against your hand's electron cloud, with the whole force of two of nature's laws behind it. Your hand floats. It has never once met the table itself.

Two things keep your hand out.

First, electromagnetism. Everything around you that feels solid is made of atoms, and every atom has a fuzzy cloud of electrons on the outside. Electrons carry a negative charge, and negative charges push each other away. Hold two magnets so the matching ends face each other and feel them push: that same push, atom against atom, is what you feel as "touch". You feel the force without anything solid actually meeting.

Second, and far stronger, the Pauli exclusion principle: no two electrons may sit in the same quantum state. Not "prefer not to". May not3. We will look at this rule properly in a moment.

And here is the part worth thinking about. The feeling of "touch" itself is made in your brain. Your skin sends a signal: pressure. Your brain turns that signal into the sensation of something hard. Richard Feynman used these laws to explain why you don't fall through the floor10, and in 1967 Dyson and Lenard, then Lieb and Thirring in 1975, proved with maths that matter is stable for exactly this reason4. To put it simply: you have spent your whole life not quite touching anything, and the physics agrees.

6All of humanity in a sugar cube

6

Eight billion people, two cubic centimetres

Now for the most surprising picture of all. Take every human alive today, eight billion of us. Remove the empty space from every atom, squeezing each nucleus against its neighbours until they pack as tightly as physics allows. What is left of humanity?

Show the maths

Nuclei pack at roughly 2.3 × 10¹⁷ kg per cubic metre17.

8 billion people × ~62 kg ≈ 5 × 10¹¹ kg
volume = mass ÷ density
        = 5 × 10¹¹ ÷ 2.3 × 10¹⁷ ≈ 2.2 × 10⁻⁶ m³
        ≈ 2.2 cm³

A sugar cube is about 1 to 2 cm³. So: one large sugar cube of humanity, perhaps two. And it would weigh exactly what humanity weighs, because we removed space, not mass17.

Fig. 3 · Artist's impression. Eight billion people, stripped of empty space, would occupy about two cubic centimetres (ref 17).

Nature really can squeeze matter like this. When a very large star dies, its own gravity can crush the atoms together until the whole star becomes a ball of packed nuclei: a neutron star. A single teaspoon of it would weigh billions of tonnes. The sugar-cube picture is not a fantasy. It is just gravity doing the squeezing.

There is a quiet reflection here too. The Quran describes worldly life as mata' al-ghurur, an enjoyment that fools. A world which feels solid but is almost entirely empty makes that old phrase feel very real, I think. The classical commentators, from al-Tabari to Ibn Kathir, read the verse as a warning against being fooled by wealth and comfort15. The science doesn't change that meaning. It just makes you feel it.

Surah al-Hadid 57:20 — the worldly life as mata' al-ghurur

وَمَا الْحَيَاةُ الدُّنْيَا إِلَّا مَتَاعُ الْغُرُورِ

"…and the worldly life is nothing but a passing pleasure that fools people."

Read the verse in its context

The full verse gives a picture: rain falls, plants grow green and thick, then they dry up and the wind scatters them. Wealth and children are the same, it says, here for a season, then gone. The warning is about the heart: don't let the short life fool you about the long one15.

Physics says something similar: even the solid ground under you is nearly all space. The verse was never about atoms. It is about where we place our trust. But the two pictures fit together well.

7The hidden ocean: quantum fields

7

First, what is a field?

Before quantum fields, a simpler question: what is a field?

A field is just something that has a value at every point in space. Temperature is the easiest example. Every point in the room you are sitting in has a temperature. Near the window, cooler. Near you, a little warmer. That invisible spread of numbers, filling the room, is a temperature field.

You have felt a magnetic field too, even if you have never called it that. Sprinkle small bits of iron around a magnet and they line up in curved lines from one end to the other. The bits of iron are not touching the magnet. They are answering something invisible that fills the space around the magnet. That is a field doing its work.

8

An electron is a ripple, not a ball

Now the deepest step. If matter isn't tiny solid balls, what is it? The answer of modern physics is quantum field theory. It says the deepest layer of reality is fields: invisible somethings with a value at every point in space, spread across the whole universe. And particles are small vibrations of those fields8.

An electron is a ripple in the electron field. A photon, a particle of light, is a ripple in the electromagnetic field. There is nowhere in the universe free of these fields. What we call empty space isn't empty. It is the fields at their quietest8.

The picture that makes this easy to understand is the ocean. A wave at sea isn't a new object dropped in from outside. It is a movement of water that was already there. Watch a calm sea and you might forget the water exists, until the wind lifts a wave and there it is again. Particles are the wave. The ocean was always there.

This isn't some strange idea from the edges of science. It is the most precisely tested theory in the history of science. The theory's prediction for a property of the electron, called its magnetic moment, agrees with the Harvard measurement of Hanneke, Fogwell and Gabrielse (2008) to better than one part in a trillion1112. One part in a trillion. That is like measuring the distance from London to New York and getting it right to within the thickness of a sheet of paper.

Fig. 4 · Artist's impression. A wave isn't a visitor to the sea; it's the sea, moving. Likewise the electron (ref 8).

Scientists' rule book for all known fields and particles has a plain name: the Standard Model. It covers almost everything, with one famous gap, gravity, which physicists have not yet managed to fit into this picture. That gap is one of the great open problems in physics. Honest science says so.

Surah al-Baqarah 2:3 — the first quality of people who are mindful of God: al-Ghayb

الَّذِينَ يُؤْمِنُونَ بِالْغَيْبِ

"Who believe in the unseen…"

Read the verse in its context

This is among the very first lines of the Quran's second chapter, and belief in al-ghayb, the unseen, is named as the first mark of those who are mindful of God15. The unseen here means God, the Hereafter, the angels, and everything beyond the reach of the five senses.

For centuries, people who believed only in what they could see and touch laughed at the very idea of an unseen reality. Then physics discovered that the entire visible universe stands on invisible fields. That proves nothing about God, and I am not claiming it does. But that old laughter now looks foolish. The visible world rests on invisible things, far more than anyone imagined.

The point is not new, either. The Confucian tradition has a line, preserved in the Doctrine of the Mean, that nothing is more visible than what is hidden13. And Plato's Allegory of the Cave says the world we see is a shadow of a greater unseen reality14. Thinkers kept arriving at the same idea from different directions.

8Why anything feels solid

9

Two laws pretending to be a table

Keep this picture in mind: a bus with one strict rule, one passenger per seat. Fill the bus, then try to sit on someone's lap. The resistance you'd meet is roughly how the quantum world treats two electrons aiming for the same state. No exceptions, no arguments.

So why does a world made of fields and empty space feel like solid wood?

Electromagnetism does part of the job, as we saw: the negative charges push apart. But by itself that push is nowhere near strong enough to make matter firm. The real work is done by Pauli's exclusion rule, proposed in 19253.

Here is how it works, in plain words. Quantum rules say a squeezed electron must make room for itself by moving faster, and moving faster costs energy. So when you compress matter, you are forcing its electrons into states that cost more and more energy. That extra energy comes back to you as a hard push against your hand. Physicists call the push degeneracy pressure. It is the same push that holds up white dwarf and neutron stars17. The floor holds you up for the same reason a dead star holds itself up. That fact alone is worth remembering.

When you press the table, then, your brain receives a signal of resistance, translates it, and calls the result solidity. Nothing hard ever met anything hard. Two laws and your brain, working together to create the feeling of a table.

The Quran says everything is created "according to a due measure", qadar. The quantum world does run on very exact ways: fixed states, fixed limits, fixed numbers15. Whether one sees design in that is a matter of faith. But that it is precise is simply a fact.

Surah al-Qamar 54:49 — everything created with qadar, a due measure

إِنَّا كُلَّ شَيْءٍ خَلَقْنَاهُ بِقَدَرٍ

"Indeed, We have created everything according to a due measure."

Read the verse in its context

A short verse, but a complete picture of the world. Everything, it says, exists within limits set by its Maker. Classical readers understood it to cover all of creation: the seed becomes a tree of a certain height, the heart beats within its range, the seasons keep their limits15.

The link with quantum physics is easy to see: electrons may take only fixed energy levels, never the gaps between; the constants of nature hold their values everywhere we look. Fixed measures, everywhere we look. Again, this is something to reflect on, not something you can test in a lab, and I offer it only as an idea.

9What holds it all together

10

The question science can't answer

Science is very good at telling us how the universe behaves. It has nothing to say about why there is a universe at all, or why it runs on laws in the first place. That isn't a failure of science. It is simply not the right tool. A violin can play you a beautiful scale, but it cannot tell you why music exists.

Here's a fact more people should know: every electron in the universe is exactly like every other electron. Same charge. Same spin. Same mass. No scratches, no history of their own, no signs of age. A hundred billion galaxies, and every electron in them is identical. Nobody knows why.

And the rules never change. Not once, anywhere, has anyone measured an electron breaking its own rules. Nature follows its rules so completely that we forget to be surprised by it. Why does the universe obey? Physics measures how well nature obeys. It cannot explain why.

The physics ends on a thought that gives me a real shiver. Every property of every material thing depends on these invisible fields doing their work, without ever stopping. If they paused for even a fraction of a second, there would be no tables, no mountains, no stars, no us. It is a thought experiment, not a theory, and I offer it only as an idea. But paired with the verse below, it amazes me: creation not as a machine switched on at the start and left to run, but as something held, moment by moment15.

Surah Fatir 35:41 — the heavens and earth, held

إِنَّ اللَّهَ يُمْسِكُ السَّمَاوَاتِ وَالْأَرْضَ أَن تَزُولَا

"Indeed, Allah holds the heavens and the earth, lest they shift away; and if they were to shift, none could hold them after Him…"

Read the verse in its context

The verse says something careful: the heavens and the earth are being held, actively, so that they do not slip away, and if they did slip, no one else could catch them15. Classical readers heard in it a God who does not just create and step away, but keeps creation going at every moment.

Read that next to a universe that stands on invisible fields which never rest, and the verse feels more meaningful to the believing reader. Not a proof. Just two pictures that fit together. There is a difference, and it matters.

10Not a proof, an invitation

Now the part I want to be clearest about. It would be easy to turn all this wonder into a claim that "science proves Islam". I won't, and I don't think anyone should. Quantum physics measures matter and energy. It has no tool that can measure God, and no experiment can answer that question. What physics does offer, to believers and sceptics, is wonder. And the Quran's own invitation is tadabbur, deep reflection, not something you can prove in a lab.

People misunderstand this subject in many ways. Here are the four I hear most:

The misunderstanding"Quantum physics proves God exists."

The honest positionIt doesn't, and it can't. Physics measures matter and energy; it has no tool that can measure God. Wonder is a good reason to reflect, not a way to win arguments.

The misunderstanding"Physicists believe the world is an illusion."

The honest positionThey don't. Fields are completely real, and a chair really does hold you up. What's wrong is the picture of matter as tiny solid balls. The world is not what it appears to be, which is not the same as being an illusion.

The misunderstanding"Atoms are like tiny solar systems."

The honest positionThat model was left behind a century ago. Electrons live in hazy clouds of chance called orbitals, with no little planets circling anywhere (ref 9).

The misunderstanding"The Quran secretly teaches quantum physics."

The honest positionThe Quran is a book of guidance, not a physics textbook. It asks people to look at creation and think. Forcing modern physics into its verses is not fair to the Quran.

Where the line sits: the physics and the Quranic citations in this article are checkable, and the sources are listed below. The pairing of the two is reflection, an invitation to think, not a claim to have proved anything.

The pearl of it all

Look past the big numbers, and the quiet conclusion is the best one: humility. The more exactly we measure the electron, the stranger and more beautiful the universe turns out to be. The Quran keeps asking us to look past the surface of things, and the more I learn of physics, the more there is to look into. I don't need quantum mechanics to be a miracle to find creation miraculous.

Quran 17:85 — the verse it all comes back to

وَمَا أُوتِيتُمْ مِنَ الْعِلْمِ إِلَّا قَلِيلًا

"And of knowledge you have been given but a little."

11Questions people often ask

Short, honest answers to the things readers ask me most.

Is the world real, then, or not?

Completely real. The point of this article is not that the world is fake. It is that the world is not what it looks like. Underneath the appearance of solid stuff there are fields, and those fields are completely real. Your table holds your cup. It just does so with fields, not with little solid bricks.

If the atom is mostly empty, why don't I fall through the floor?

Two reasons. The outside of every atom is a cloud of negative charge, and negative charges push each other away. And the Pauli exclusion principle forbids two electrons from sharing the same state, so squeezing matter together costs energy, and matter pushes back. Empty space, yes. Soft, no.

Can anyone actually see a quantum field?

No, and that is the point of the word invisible. But we see what fields do every day. A magnet lifting a paperclip is showing you a field. Light itself is a wave in the electromagnetic field. Every chemical reaction is fields at work. Invisible does not mean doing nothing.

Do physicists believe in God?

Some do, some don't. There are believers at the highest levels of physics and there are firm unbelievers. Physics itself cannot answer the question: it has no experiment that can test it. Anyone who tells you science has answered the God question, one way or the other, is not telling the truth.

Did the Quran know about quantum physics?

I don't think that is the right question. The Quran speaks about the unseen, about measure, and about a world that fools people who do not pay attention. Those verses were understood and loved for fourteen centuries before quantum physics existed. Modern science can make the verses feel new again. It cannot put claims on them that they never made, and we should not try.

What is the simplest takeaway from all of this?

This: the world is much stranger, much more ordered, and much less solid than it looks, and it holds together every single second. What you do with that fact, whether it moves you towards faith or simply towards wonder, is up to you. Both are honest responses.

12Test yourself

Seven quick questions on what we covered. Answer in your head first, then reveal.

1. How much smaller is a nucleus than its atom?

About 63,000 times. Scale the nucleus up to a football, and the electron's cloud begins some 14 kilometres away.

2. What did Rutherford's team fire at the gold foil?

Alpha particles, tiny specks from radioactive material. Most passed straight through; a few bounced back, and that revealed the nucleus.

3. Why doesn't your hand pass through a table, if both are mostly empty space?

Electromagnetic repulsion between the electron clouds, plus the Pauli exclusion principle: one seat per passenger, no exceptions.

4. In quantum field theory, what is an electron?

A small ripple, a raised wave, in the invisible electron field that fills all of space. A photon is a ripple of the electromagnetic field.

5. How precisely does our best theory match experiment?

Quantum electrodynamics predicts the electron's magnetic moment to better than one part in a trillion (Hanneke, Fogwell and Gabrielse, 2008).

6. Are all electrons identical?

Yes. Same charge, same spin, same mass, everywhere in the universe. Nobody knows why.

7. All eight billion humans, compressed to nuclear density, would fill…?

About 2.2 cubic centimetres. One large sugar cube, perhaps two, weighing exactly what humanity weighs.

13What I took away

Eight things I'll remember

• The universe keeps two rule books: simple classical physics upstairs, and strange quantum rules downstairs, with particles tunnelling through walls and acting like waves.
• The schoolbook atom is wrong. Matter is almost entirely empty space, and the nucleus is a grain of sand in a stadium.
• You have never truly touched anything. Touch is fields pushing back fields, through electromagnetism and Pauli's rule.
• Humanity, with the gaps removed, fits in a sugar cube and still weighs the same.
• The deepest layer of reality we know isn't particles but fields, and that theory matches experiment to one part in a trillion.
• Every electron in the universe is exactly like every other electron, and the rules never change. Physics measures how well nature obeys; it cannot explain why.
• The four Quranic verses at the heart of this piece, on the unseen, the measure of things, the short-lived world, and the One who holds it all, are worth reading slowly.
• It's reflection, not proof. Saying so plainly isn't a weakness; it is the honest position, and the wonder survives it perfectly well.

14If you want to dig deeper

Every number and date in this article comes from somewhere. The papers and texts behind each step:

1. Rutherford, E. (1911). "The Scattering of Alpha and Beta Particles by Matter and the Structure of the Atom." Philosophical Magazine, 21, 669-688. The paper that established the nuclear atom.
   doi.org/10.1080/14786440208637080
2. Geiger-Marsden experiments (1908-1913). The gold-foil series showing the atom is mostly empty space.
   en.wikipedia.org/wiki/Geiger-Marsden_experiments
3. Pauli, W. (1925). "Uber den Zusammenhang des Abschlusses der Elektronengruppen im Atom mit der Komplexstruktur der Spektren." Zeitschrift fur Physik, 31, 765-783. The exclusion principle; Nobel Prize 1945.
   doi.org/10.1007/BF02980631
4. Dyson and Lenard (1967), "Stability of Matter I", J. Math. Phys. 8, 423; Lieb and Thirring (1975), "The Stability of Matter", Phys. Rev. Lett. 35, 687.
   en.wikipedia.org/wiki/Stability_of_matter
5. Tonomura et al. (1989). "Demonstration of single-electron buildup of an interference pattern." American Journal of Physics, 57, 117-120.
   doi.org/10.1119/1.16104
6. Merli, Missiroli and Pozzi (1976), American Journal of Physics, 44, 306; plus the 2002 Physics World poll and the history in Am. J. Phys. 80, 615 (2012).
   pmc.ncbi.nlm.nih.gov/articles/PMC4617474
7. Gamow, G. (1928). "Zur Quantentheorie des Atomkernes." Zeitschrift fur Physik, 51, 204; Gurney and Condon, Nature 122, 439 (1928). Tunnelling and alpha decay.
   doi.org/10.1007/BF01343196
8. Stanford Encyclopedia of Philosophy. "Quantum Field Theory." Fields as fundamental; particles as vibrations; the quantum vacuum.
   plato.stanford.edu/entries/quantum-field-theory
9. Griffiths and Schroeter (2018). Introduction to Quantum Mechanics, 3rd ed., Cambridge University Press.
10. Feynman, Leighton and Sands (1964). The Feynman Lectures on Physics, Vol. III. Free online.
    feynmanlectures.caltech.edu
11. Hanneke, Fogwell and Gabrielse (2008). "New Measurement of the Electron Magnetic Moment and the Fine Structure Constant." Physical Review Letters, 100, 120801.
    doi.org/10.1103/PhysRevLett.100.120801
12. Precision tests of QED. Theory and experiment agree to better than one part in a trillion.
    en.wikipedia.org/wiki/Precision_tests_of_QED
13. Confucius (trad.), Doctrine of the Mean (Zhongyong), ch. 1; James Legge, trans.: "There is nothing more visible than what is secret, and nothing more manifest than what is minute."
    ctext.org/liji/zhong-yong
14. Plato (c. 375 BC). Republic, Book VII, 514a-520a, the Allegory of the Cave.
    classics.mit.edu/Plato/republic.html
15. The Quran. Al-Baqarah 2:3; al-Hadid 57:20; al-Qamar 54:49; Fatir 35:41; al-Isra 17:85. Compare Saheeh International and Pickthall. Classical exegesis: al-Tabari; Ibn Kathir.
    quran.com/2:3
16. NIST, CODATA constants. Proton-electron mass ratio about 1,836.15; the electron shows no measurable size.
    physics.nist.gov/cuu/Constants
17. Nuclear density about 2.3 x 10^17 kg/m3, the basis of the sugar-cube estimate; independent estimates give 1.6-2.5 mL for all humanity.
    en.wikipedia.org/wiki/Neutron_star
18. Heisenberg, W. (1927). "Uber den anschaulichen Inhalt der quantentheoretischen Kinematik und Mechanik." Zeitschrift fur Physik, 43, 172-198. The uncertainty principle.
    doi.org/10.1007/BF01397280
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The illustrations are original artist's impressions made for this article, not photographs or experimental data. The Quranic verses quoted here are short passages, used for study and reflection.