How many kinds of elementary particles should I say there are? In experiments at the Large Hadron Collider, physicists smash ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The particles that are in ...

Add Yahoo as a preferred source to see more of our stories on Google. They're tiny, invisible, and travel across the universe. And trillions of them just flew through your body. What are they?