• 

  Now Playing
  Summer has officially begun

  00:09
• 

  Now Playing
  Loud, massive funnel tornado sweeps through Idaho

  00:17
• 

  Now Playing
  Floodwaters are now waist-deep across Texas

  00:14
• 

  Now Playing
  Why you need water shoes

  00:46
• 

  Now Playing
  European Space Agency shares Rosetta probe's last images of Comet 67P

  00:45
• 

  Now Playing
  Enjoy stargazing? Try taking on astrophotography

  01:00
• 

  Now Playing
  What you should and shouldn't do if you get sand in your eyes

  01:00
• 

  Now Playing
  What really happens when you pee in the pool?

  00:56
• 

  Now Playing
  Watch drone find missing man stuck in marsh in seconds

  00:19
• 

  Now Playing
  What is the Midnight Sun?

  00:56
• 

  Now Playing
  Koko the gorilla, famous for learning sign language, dies at 46

  02:32
• 

  Now Playing
  Flood waters ravage Texas, interrupts Melania Trump's visit to border facility

  01:00
• 

  Now Playing
  Mars dust storm has encircled the entire planet

  00:32
• 

  Now Playing
  Weatherproofing hair and makeup for outdoor weddings

  01:00
• 

  Now Playing
  Incredible video shows horses calmly grazing as massive funnel cloud swirls behind them

  00:17