Hundreds of dams are being proposed for Mekong River basin in Southeast Asia. The negative social and environmental consequences -- affecting everything from food security to the environment -- greatly outweigh the positive changes of this grand-scale flood control, according to new research.

A Russian-made Soyuz booster rolled out to its launch pad in French Guiana on Friday, and hydraulic lifts rotated the launcher vertical in preparation for liftoff Tuesday with the first in a new series of French military spy satellites.

The Arctic has been warmer in the last five years than at any time since records began in 1900, a report from a United States scientific agency found.

A lone mutation in a single gene may be a culprit in frontotemporal dementia, which can strike patients as young as 40.