5 things to know about the Eiffel Tower

Extras

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  The Rocket-Less Future of Space Travel

  Space elevators? Nuclear rockets? The future of space travel could look radically different.

  5:17
• 

  Do Aliens Exist? This Famous Equation Offers a Clue

  The Drake Equation helps scientists estimate the odds of finding intelligent alien civilizations.

  5:04
• 

  4 Ways the Universe Could End

  If the universe as we know it started with the Big Bang, will it also have an end?

  5:07
• 

  Building Blocks of Life Discovered on Distant Asteroid

  Scientists have discovered the building blocks of life in samples retrieved from a distant asteroid.

  6:03
• 

  Revolutionary War Weapons Preview

  Explore key military technologies in the American colonies’ fight for freedom.

  0:30
• 

  What Went Wrong on the Dali Before the Baltimore Bridge Collapse

  The container ship Dali lost power causing it to crash into Baltimore’s Key Bridge.

  2:57
• 

  What Caused Baltimore’s Key Bridge to Collapse?

  Engineers explain how a vulnerability made the bridge open to catastrophe.

  2:57
• 

  This Pompeii Priest Had an Unexpected Rise to Power

  In a recently discovered tomb in Pompeii, archeologists made a startling discovery.

  2:58
• 

  A Brutal Gladiator Fight in Ancient Pompeii

  At a gladiator match in ancient Pompeii, tensions exploded and spectators became fighters in a riot.

  2:37
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  This Asteroid Might Make Impact With Earth in 2032

  An asteroid is on a collision course with Earth, possibly making impact in 2032.

  3:33