Life's Little Mysteries: Science questions, answered

It's well known that earthquakes can rock fault-filled places like the U.S. West Coast. But why do earthquakes happen in the middle of tectonic plates?

Spacecraft have visited and photographed the far side of the moon, but why can't we see it from Earth?

Infinite mirrors are a fun party trick, but the physics behind this phenomenon explains why it may not be true.

The simple question of "why five" has puzzled scientists from multiple fields, and the answer still isn't entirely clear.

And like dogs, why do cats also sniff fellow felines' behinds?

Cats are masters of contortion — and the laws of physics — which helps them stick the landing more times than not.

Ultraviolet has very short and energetic wavelengths that are shorter than violet on the visible spectrum. But can people see UV?

What's the science behind starting a fire with flint and steel?

Lab research often gives one answer about whether smiling can make you feel happier, but does that translate to the real world?

Why don't dogs claws retract like felines' do?