Before and after humans

Related: Technology & science

1. Headlines
   1. Scientists study Tornado Alley's past and future

      Did Monday's devastating tornado follow a well-worn storm track? Does "Tornado Alley" experience the nation's deadliest twisters? How will climate change affect future tornadoes? Scientists have some answers — but they have still more questions.

   2. Why tornadoes have been one after another
   3. Tumblr's teenage wasteland: Wait till Mom and Dad find out
   4. White House, NASA pay tribute to Sally Ride
   5. Dolphins persuade humans to raise rare torpedo
   6. Curiosity drills into second Mars rock
   7. Flickr gets new look, 1 terabyte of free space
2. Multimedia
   1. 
      Video
      Oklahoma tornado may be rated EF5 or higher
   2. 
      Video
      Hands-on impressions: 'The Elder Scrolls Online'
   3. 
      Video
      Many smartphone users not using passwords
   4. 
      Video
      Teen’s device charges a phone in 20 seconds