Why does light carry energy even though it has no mass? This video explains the real physics behind photons, energy–momentum relationships, and how light can transfer energy and momentum without mass.

Every generation grows up with starships that jump across galaxies in a heartbeat, but the real universe is far less ...

Does the universe notice that we're paying attention to a quantum experiment? The answer goes against everything we thought we knew.

Three thought experiments involving “demons” have haunted physics for centuries. What should we make of them today?