News
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PhysicsNuclear split surprises
Physicists spot a new and unexpected type of lopsided fission in the element mercury.
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ChemistryBacterium grows with arsenic
A microbe appears to substitute a normally toxic element for a basic ingredient of life, raising intriguing questions about the limits of biochemistry.
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HumansFood security wanes as world warms
Global warming may have begun outpacing the ability of farmers to adapt, new studies report.
By Janet Raloff -
SpaceIt’s really full of stars
Astronomers find such an abundance of red dwarfs in eight nearby galaxies that they suggest the stellar population of the universe may be three times current estimates.