Life on our planet has experienced many mass extinctions over its 4.5 billion years. Scientists see evidence for at least ...

Depending on your definition, the Earth features many "biggest" living things. Today we're looking at where they stack up ...

If everyone on Earth jumped at the same time, we wouldn't change the Earth's orbit in space, but we could cause a lot of damage on Earth. Special thanks to astrophysicist Paul Sutter at The Ohio ...

The Earth is really, really old. Over 4 1/2 billion years old, in fact. How do we begin to comprehend a number that large? It helps to put it on a more fathomable scale. Watch to see where Earth's ...