What is a thing?

Why do things happen?

And why DO they happen the way they do?

Let's try to approach this step by step.

What are you made of?

You are matter,

which is made of molecules,

which are made of atoms,

and those are made of elementary particles.

But, if elementary particles are the smallest things that exist,

What are THEY made of?

To answer a simple question, let's start simply.

Let's wipe the universe clean.

Away with matter, antimatter, radiation, particles, anything.

Now let's take a closer look at absolutely nothing.

What is empty space?

Is it what we call a vacuum?

There are no atoms, no matter, nothing!

Is it really all that empty?

Nothing gives us the building blocks for everything.

In a sense, empty space is a lot like a vast, calm ocean.

While the water is very still when nothing is happening,

a stiff breeze can create some serious waves.

Our universe works a lot like this.

There are these oceans everywhere.

Physicists call them fields.

This might be strange and new,

but think about radiation for example.

By exciting what's known as the electromagnetic field, a little kink is created

which is the particle we call the photon.

The particle that carries radiation, we perceive it as light.

This isn't unique to light; every particle in the universe is made this way.

There are fields for every particle of matter all with their own rules.

For example, along with the electromagnetic field, there is an electron field everywhere in the universe

and little kinks in that field are electrons.

All together, the fields of our universe can produce 17 particles which can be divided into 3 categories.

The leptons, and the quarks, and the bosons.

Leptons consist of the electron as well as its cousins: muon and tau particles.

Each has an associated neutrino.

Then, there are quarks.

The quarks are the nuclear family of particles.

They're always found bound together in groups and pairs

and make up protons and neutrons, which make up the nuclei of atoms.

Together, the leptons and quarks are the matter particles.

They make up all the things you see.

The air you breathe, the sun that warms you,

the computer you're using right now to distract yourself from the stuff you should be doing.

But things don't just exist, they also do stuff.

In some philosophical sense, the properties of a thing are just as much a part of it as existence itself.

This is where the bosons and the fields that makes them come in to play.

While the quarks and leptons are made by the matter fields,

the bosons are made by force fields.

We call a rule of the universe a force.

And so far, 4 fundamental forces have been discovered:

Electromagnetism, gravity, and the strong and weak nuclear forces.

These forces are the rule book of a game where the pieces are the particles, and the game is the universe.

They tell particles what they can do and how they can do it.

Bishops move diagonally,

massless particles move at the speed of light,

knights can jump,

gravity attracts.

The forces are the rules for how particles interact

Which ultimately make them the rules for how particles assemble into all the big things we see in the universe.

Gravity isn't just the rule for orbits around the sun or apples falling from trees.

As a rule, it says matter attracts, which builds planets and stars.

Electromagnetism isn't just the rule for magnets attracting or repelling, or electric currents in light bulbs.

It governs all atomic bonds, building every molecule.

Together, forces and particles are sort of like the Tinkertoys of existence.

The bosons are like messengers. Passed between, you could say, connecting the matter particles.

Which they use to tell each other how to move.

Each particle uses a certain set of the forces to interact with other particles.

Quarks, for example, can interact with each other with electromagnetism and the strong nuclear force,

but electrons don't use the strong force, just electromagnetism.

The quarks exchange strong force bosons, communicating the strong nuclear attraction to each other,

while the protons they build exchange the particles of electromagnetism, photons with the electrons.

Thus, the quarks end up locked up in nuclei,

while the electrons remain attached by their electric attraction, building atoms.

Even though the universe has lots of big, messy phenomena like life, supernova, and computers,

that seem complex on the surface.

If you zoom in far enough on anything, you just get 17 particles emerging from underlying fields,

playing a game with 4 rules.

To summarize, in the most basic form we know right now, this is what things are.

This theory is what physicists call the Standard Model of Particle Physics.

You are basically nothing more than disturbances

on an ocean that's excited by energy and guided by forces that make up the rules of the universe.

But why? And what is a force?

We'll have to explore a few more simple questions to get to the bottom of this.

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