Three space station crewmen return safely to Earth in Kazakhstan
Nest acquires green software startup MyEnergy
On Twitter, dubious health claims from e-cigarette bots
U.S. top court leaves intact New York City pregnancy center rule
Scientist hopes to unlock Ebola's secrets at outbreak's source
Exclusive: Scientists tell U.S. - find recipe for Ebola cure in survivors' blood
Passing comet peppered Mars with shooting stars, scientists say
Acoustic warfare: bats jam each other's sonar while bug hunting
