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The strongest candidate for an axion, called a QCD axion -- named after the reigning theory of the strong force, quantum chromodynamics -- theoretically interacts with all matter, though weakly, through the four forces of nature: gravity, electromagnetism, the strong force, which holds atoms together, and the weak force, which explains the breakup of atoms.

“As human beings, we want to understand nature, and part of understanding nature is to understand quantum chromodynamics and the strong force,” says physicist Haiyan Gao, associate laboratory director for nuclear and particle physics at Brookhaven.

Quantum chromodynamics describes the interactions between quarks and gluons by ascribing them a property called color charge.

This color charge is akin to electrical charge in the theory of electromagnetism, and it also explains why quantum chromodynamics so quickly gets out of hand.

You are not elbowing your way onstage at a lecture on quantum chromodynamics.