Life's Little Mysteries: Science questions, answered

Fireflies use a glowing chemical reaction to signal to one another in the dark of dusk and night.

Our human ancestors arose in Africa due to many factors, including climate.

Pilots have been doing barrel rolls in small planes throughout the history of aviation. But has anyone ever attempted this maneuver in a commercial airliner?

On a clear day, sometimes a green flash appears with the sun on the horizon just after sunset or before sunrise. But why does this happen?

Do galaxies, including our own Milky Way, orbit anything in the universe?

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.