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Who killed Masoud Alimohammadi, the Iranian physicist who was blown up outside his apartment in Teheran on 12 January by a remote-controlled motorcycle bomb? Emerging details of the professor's scientific and political life have strength
A chimeric mouse with a humanized liver offers a novel window into drug toxicity.
Researchers have harnessed the chemical degradation of fossil DNA to determine methylation patterns that may reveal which genes were turned on, or off, in ancient human species.
Jennifer Francis has made waves linking the melting Arctic to extreme weather around the world. But a storm of criticism has forced the climate scientist to defend her hypothesis.
The latest Intergovernmental Panel on Climate Change report, on mitigating emissions, finds a few glimmers of hope amid gloomy projections.
A new find from NASA's Kepler orbiting observatory is the first Earth-sized planet to be detected in the habitable zone of a star.
Soaring cost estimates are jeopardizing the U.S. contribution to ITER, the massive international fusion energy project.
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