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Humans

From the July 31, 1937, issue

Giant dragonflies from the Carboniferous period, a dust cloud obscuring stars near the sky's north pole, and a list of 13 inventions predicted to have great social significance.

Ecosystems

Biota Behaving Badly

Members of an established ecosystem develop a sense of balance, usually permitting at least limited biodiversity and a stable structure. When interlopers arrive that aren’t responsive to the same environmental checks and balances, they can overrun the ecosystem, eliminating some members and quickly dominating others. Such bullying immigrants are known as invasive species—and they can […]

Health & Medicine

New Clues: Gene variations may contribute to MS risk

Variants of two genes encoding immune system proteins may confer a higher risk for multiple sclerosis.