HOW MUCH YOU NEED TO EXPECT YOU'LL PAY FOR A GOOD SCIENCE

On the other hand, as the temperature in the universe continued to slide, hadron–anti-hadron pairs had been not created. The majority of the hadrons and anti-hadrons had been then eliminated in particle–antiparticle annihilation reactions, leaving a small residual of hadrons because of the time the universe was about 1 2nd previous.[142]: 244