Light is fast. In fact, it is the fastest thing that exists, and a law of the universe is that nothing can move faster than light.
Many anthropologists see bipedalism - which means walking on two legs - as one of the defining characteristics of "hominins," or modern humans, and their ancestors.
Attention-deficit hyperactivity disorder is a common, yet often misunderstood, mental health condition.
As a pediatric dentist, I sometimes get questions from parents and patients about chewing ice. They generally want to know why some people enjoy doing it and whether it can harm teeth.
What did White children have to say about their "all-White" schools integrating?
About 6.1 million children in the U.S., more than 9% of all kids and teens, have been diagnosed at some point in their lives with attention deficit hyperactivity disorder.
Look up at the sky on a clear night, and you'll see thousands of stars - about 6,000 or so. But that's only a tiny fraction of all the stars out there.
Every time you decide to move your body, whether it's standing up, walking around or playing sports, your brain sends signals to your muscles to make sure they move correctly.
The ancient Greeks proved over 2,000 years ago that the Earth was round and figured out how big it was by using simple observations of the Sun.