Life's Little Mysteries: Science questions, answered

People report vivid dreams during rapid-eye-movement sleep. But is this sleep stage really the only time we dream?

There are many theories for why cats and dogs eat grass, and some could be "old wives' tales."

The vast majority of polished diamonds are clear and sparkly, but some come in unexpected colors like blue, green and even pink. So why are some diamonds different colors?

Telescopes have come a long way since the first one was invented in 1608. So what's the most powerful telescope operating today, and how far can it see?

Frogs can breathe and drink through their thin skin — but how does that work?

Rome continued on after the Western Roman Empire fell but faced war and a population crash.

It's a well-known fact that most cats despise getting wet. But why?

Will we ever have an underwater tunnel between New York and London?

Other metals might be worth their weight in gold, but can they be turned into it?

After the sun goes out, what will happen to the solar system — and how long will it last?