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New observations by rovers and orbiters indicate that liquid water not only existed on Mars, it once covered large parts of the planet's surface, perhaps for more than a billion years
Studies of pet dogs with cancer can offer unique help in the fight against human malignancies while also improving care for man's best friend
An extraordinary new human fossil renews debate over the evolution of upright walking
"Supercontinuum" laser light has enabled the most precise frequency and time measurements ever and might drive optical data transmission rates to record speeds
The century-old artifact that defines the kilogram, the fundamental unit of mass, is to be replaced by a more accurate standard based on an invariant property of nature
Learning how rats escape from cats also reveals how a storm of electrical pulses sweeping across the brain is translated into information
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