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ENVIRONMENT
See good news for birds in “So far, the great tit has coped with climate change.”

LIFE
Fossils show how birds shifted their weight as they evolved. Read “Birds may have had to crouch before they could fly.”

Flowerlike corals pulsate to boost photosynthesis by algae harbored inside. See “Why corals do calisthenics.”

RANDOMNESS
Tom Siegfried examines theories of generosity in “Greed may breed financial fitness, but evolution allows unselfishness to survive.”