Why Bats Share Blood

Extras

• 

  This Massive Skeleton Belongs to an Ancient Whale

  At first, scientists thought it was a gigantic marine reptile.

  2:28
• 

  How Music is Made Up of Math

  Pythagoras saw a connection between math, music, and nature.

  2:01
• 

  Critical Condition: Health in Black America Preview

  After centuries of pseudoscience, researchers examine the causes of racial health disparities.

  0:30
• 

  How Deadly Was the Musket?

  A team of experts put an 18th-century musket to the test — revealing how deadly it really was.

  4:57
• 

  The World’s First Combat Submarine

  Its nickname was the “Turtle”.

  10:49
• 

  These Smart Glasses Know Who You Are, and Much More

  Two students created glasses that can identify people on the street, without them knowing.

  4:18
• 

  Why Just Planting Trees Won’t Save the Planet

  Could restoring lost forests help slow climate change?

  3:04
• 

  Ultimate Crash Test: Impact Preview

  Forensic science is put to the test after the first-ever staged multi-vehicle pileup.

  0:30
• 

  When Machines Prescribe

  Investigate medical algorithms in which the patient’s race drives decisions.

  17:19
• 

  Do Plants Know Math?

  Evolution seems to favor these numbers.

  2:24