Conversation so far:
in the big bang which particles formed first
The quarks and leptons were amongst the first particles to appear in the big bang.
What is a quark?
A quark is a type of elementary particle and a fundamental constituent of matter.
What is a lepton?
In particle physics, a lepton is an elementary particle of half-integer spin that does not undergo strong interactions.

Question: can you tell me about the spin
Self-contained rewrite: What is half-integer spin?