• 

  Now Playing
  Refreshing blast of cooler air to persist across southern US

  01:59
• 

  Now Playing
  NASA spacecraft spots Curiosity rover

  00:53
• 

  Now Playing
  Oceans play important role for absorbing greenhouse gases

  00:36
• 

  Now Playing
  NASA's Kepler telescope finds potential new worlds

  01:00
• 

  Now Playing
  Tornado touches down over Home Depot store in New Jersey

  00:47
• 

  Now Playing
  Air tankers battle Goodwin Fire in Arizona

  00:10
• 

  Now Playing
  Woman saved from car trapped in Alabama flooding

  00:33
• 

  Now Playing
  Pacifica Fire towers over homes in Westlake Village, California

  00:14
• 

  Now Playing
  At least 15 dead and 118 people missing after terrifying landslide

  01:00
• 

  Now Playing
  Chickasawhay River water level approaches highest since 1990

  00:20
• 

  Now Playing
  Trees and power lines knocked down in central New Jersey

  00:20
• 

  Now Playing
  Scientists study plant growth in space

  01:00
• 

  Now Playing
  Humpback whale breaches right next to boaters

  00:18
• 

  Now Playing
  Devastating landslide kills 15 and buries 118 people in China, rescue workers search for survivors

  00:20
• 

  Now Playing
  Army of fire ants build living raft during flooding from Tropical Storm Cindy

  00:23