As the universe expanded and cooled further, the quarks clumped together to form the first hadrons, the most well known of which are the protons and neutrons. This is known as the hadron epoch. As the ...

Baryons are subatomic particles made up of an odd number of quarks. Protons and neutrons found at the center of atoms are a type of baryon, but there is a whole menagerie of other baryons made of ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...