What are intercontinental ballistic missiles (ICBMs), and why are they hard to shoot down?

Once upon a time, knighthood was serious business, and for countless medieval fighters, their armor was what stood between life and death. NOVA challenged a blacksmith and master armorer to recreate parts of an elite armor. We trace their journey as they rediscover centuries-old metalworking secrets, then put their new armor to the ultimateultimate test against a period musket.

Knights and firearms clashed on the battlefield for over 200 years. Did some of these warriors have armor strong enough to stop bullets?

Hurricane Harvey broke continental U.S. records. Here's how cities can be better prepared.

Stonehenge is the grandest and most enigmatic of Europe’s prehistoric monuments, and has inspired countless theories to explain who built it and why. Join NOVA as we reveal intimate details of the Stonehenge people and why their power began to fade soon after they raised the mighty stones.

On September 15, 2017 NASA destroyed Cassini—on purpose. Why kill a multibillion-dollar spacecraft?

Relive Cassini's greatest hits from its 13 years studying Saturn.

Cassini, a brave explorer that was dispatched to study a distant ringed world, has died.

Is there life beyond Earth? The solar system's ocean worlds might be the most promising places to look.

Aiming to skim less than 2000 miles above the cloud tops, no spacecraft has ever gone so close to Saturn, and hopes are high for incredible observations that could solve major mysteries about the planet’s core. Join NASA engineers for the tense and triumphant moments as they find out if their bold re-programming has worked, and discover the wonders that Cassini has revealed over the years.

Why don't solar eclipses happen every month? After all, you only need three things to make a solar eclipse: the Sun, the Earth and the Moon.

A how-to guide for anyone planning to build a universe.

The total solar eclipse of 1919 led Albert Einstein down the path toward stardom. Here’s how.

With the US eclipse just over a week away, here’s how you can watch it safely.

On August 21, 2017, millions of Americans will witness the first total solar eclipse to cross the continental United States in 99 years. While hordes of citizens prepare to flock to the eclipse’s path of totality, scientists, too, are staking out spots for a very different reason: to investigate the secrets of the sun’s elusive atmosphere.

What if everything in the universe came to your doorstep...in a box?!

On August 21, 2017, millions of Americans will witness the first total solar eclipse to cross the continental United States in 99 years. While hordes of citizens prepare to flock to the eclipse’s path of totality, scientists, too, are staking out spots for a very different reason: to investigate the secrets of the sun’s elusive atmosphere.

Rabies is preventable, but it still plagues around 60,000 people a year.