Add Yahoo as a preferred source to see more of our stories on Google. An artist's concept of multiple types of subatomic particles. (Mark Garlick/Science Photo Library) Forget about turtles; for all ...

Our existence rests on a razor‑thin imbalance in the early cosmos. When the universe was young, matter and antimatter should ...

Everything we see around us, from the ground beneath our feet to the most remote galaxies, is made of matter. For scientists, that has long posed a problem: According to physicists’ best current ...