Interesting Things

Things I found interesting this morning:

• Identical twins do not have identical genomes, but can differ by the number of copies of individual DNA segments (or by missing segments). Here's the paper by Dumanski et al.
  
• The list of the top 15 Grand Engineering Challenges for the 21st century.
  
• Science News: "sleep is a necessity for every animal that's ever been studied." Omnivores sleep more than herbivores. Some animals sleep in the ocean with half their brain active and one eye open. Some animals sleep while flying. Personally, I love sleep.
• Coldplay: "Fix You."
• General Motor's Vice Chairman Bob Lutz calls global warming "A total crock of shit." I wonder if Bob's scientific skills are as good as his business skills--GM lost $38B last year.