A Moment of Science
Whether from playing too much basketball or jogging in ill-fitting sneakers, we've all had blisters. But what are blisters, and how do they form?
The body must produce the liquid part of blood, called plasma, and the cells that float in it.
Fire is a chemical reaction between oxygen molecules and some kind of fuel. This reaction releases the heat and light that we call fire.
The ancient Greeks believed that fire--along with earth, water, and air--was one of the four essential elements that made up the world.
What's the biggest magnet ever? Find out on this Moment of Science.
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