Galileo's Experiments

How do scientists use mathematics to define reality? And why?

Columbia's Brian Greene explains why history’s greatest scientific thinkers, from Newton to Feynman, became his heroes.

That’s what Einstein called it, dismissively, but ultra-strange quantum entanglement does exist, Brian Greene writes.

Brian Greene explains Einstein’s notion of the mutability of space and time in a way you can readily understand it.

USC theoretical physicist Clifford Johnson contemplates the controversial notion of multiple universes.

What do you get when you introduce a chunk of sodium to a Bunsen burner? Sizzling romance.

What are atomic clocks? And why do we need them?

Learn how to send top-secret messages using quantum mechanics.

The Fabric of the Cosmos, Hour 1: Surprising clues indicate that space is very much something and not nothing.

The Fabric of the Cosmos, Hour 4: Is our universe unique, or could it be just one in an endless “multiverse”?

Try your hand at NOVA’s first crossword puzzle. It’s fast, physics-based, and fun.

Join Albert Einstein on a high-speed cab ride to see why space and time are truly in the eye of the beholder.

In this interactive periodic table, explore the elements and their properties and abundances.

See if you can build a cathedral arch without it collapsing, and learn more about the forces at work.

Create and save your own wildly colorful fractals using our generator.

The concept of “space” is a tough one to explain, even for a Nobel prize-winning physicist.

Physicist Peter Galison says that humans sense time as moving constantly forward, but it doesn’t really work that way.

Physicist Sean Carroll says there's no such thing as past or future in the elementary laws of physics.

Physicist Max Tegmark says that time is still one of the biggest mysteries in physics.

Physicist Janna Levin says that Einstein and Newton had very different ideas about what space and time really are.