Volcanic Rock Hints at Source of Earth's Water
Hydrogen isotopes suggest that some water was present when the planet formed
Stories by Chris Cesare
Rosetta Sniffs Oxygen around Comet 67P
The presence of the gas could have implications for theories of the early solar system
Math Whiz Solves a Master's Riddle
Fields Medal winner Terence Tao successfully attacks the Erdős discrepancy problem by building on an online collaboration
Cryptographers Brace for Quantum Revolution
Encryption fix begins in preparation for arrival of futuristic computers
Polar Bear Metabolism Cannot Cope with Ice Loss
The Arctic mammals may not survive the ongoing loss of their hunting grounds
