Three groundbreaking scientists, all of whom won the Nobel Prize for their discoveries, died in 2013. Francois Jacob figured out how genes work. Frederick Sanger, who sequenced the first genome, is one of only four people to win two Nobel Prizes. David Hubel found out how to listen to the brain.
The end of December is a crucial deadline for removing chemical weapons from Syria. Now the OPCW, the international organization overseeing that transfer, is backing away from that deadline. NPR's Geoff Brumfiel discusses the plan for chemical weapons removal and disposal, and why it's been so hard.
Archaeologists are now mapping a wall in eastern China that is as much as 15 feet tall in some places, and predates the more famous barrier by 300 years. Hundreds of miles long, it was likely erected to keep neighboring Chinese dynasties from invading each other, historians say.