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Radiation levels at the Martian surface appear to be roughly similar to those experienced by astronauts in low-Earth orbit, NASA's Mars rover Curiosity has found. The rover's initial radiation measurements — the first ever taken on the surface of another planet — may buoy the hopes of human explorers who may one day put boots on Mars, for they add more support to the notion that astronauts can indeed function on the Red Planet for limited stretches of time.

Scientists have identified a new gene variant that seems to strongly raise the risk for Alzheimer's disease, giving a fresh target for research into treatments for the mind-robbing disorder.

Rob Dunn and his team of ecologists aren't your average navel gazers... From 60 belly buttons, the team found 2,368 bacterial species, 1,458 of which may be new to science.

Scientists at the respected University of Innsbruck say that between 1902 and 2007, glaciers contributed 11 centimeters (4.33 inches) to a total sea level rise of about 20 centimeters (nearly 8 inches).

On an Election Day filled with upsets, the father of evolutionary theory proved incapable of riding the wave down in Georgia. Fictional write-in candidate Charles Darwin was promoted around Georgia's 10th congressional district to provide a symbolic challenge to Rep. Paul Broun (R-Ga.), the outspoken congressman who created a stir earlier this year when video emerged of him calling evolution and the big bang theory "lies from the pit of hell."

Climate scientists agree the Earth will be hotter by the end of the century, but their simulations don’t agree on how much. Now a new study suggests the gloomier predictions may be closer to the mark.

NASA's Curiosity rover reports confirmation that Mars has lost at least half of its early atmosphere.

At the Everland Zoo in South Korea, there is a young male elephant that can speak Korean. His vocabulary includes “annyong” (hello), “anja” (sit down), “aniya” (no), “nuo” (lie down) and “choah” (good). Researchers say the elephant, whose name is Koshik, vocalizes in a novel way: he puts his trunk in his mouth.

Wow, what a view of the Curiosity rover! This is a self-portrait mosaic made from brand new images taken by the MAHLI (Mars Hand Lens Imager), the high-resolution camera located on the turret at the end of MSL’s robotic arm. The arm was moved for each of the 55 images in this mosaic, so the arm doesn’t show up in the mosaic. This montage was put together by Stuart Atkinson, and he notes that these images are just the low-res thumbnail images that have just been sent to Earth. “Imagine what the hi-res version will look like!!” Stu said.

Using NASA's Fermi Gamma Ray Space Telescope, scientists were able to detect the light of the earliest stars, which are now long since gone... One of the primary goals of the Fermi Gamma Ray Space Telescope is to measure the starlight in the universe and use that to figure out how much light has ever shone in it. Yesterday, astronomers on Fermi’s research team announced that they have reached that goal.