Alexa goes hands-off for Amazon's new Fire HD 10 tablet
The plan to send 50 small spacecraft to tour 300 asteroids
Scorching hot Mercury looks icier than previously thought
Wireless system transmits both power and data simultaneously
Animal, vegetable or mineral? Strange fossil's identity finally confirmed
Why haven't we evolved immortality? The answer is in our genes
Carbon dating reveals the earliest written record of the number "zero"
Astronomers map out the Moon's best watering holes