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Life

Fossil pushes back land-animal debut

Creatures first squished mud through their five toes millions of years earlier than previously believed.

Physics

Plants’ reproductive weaponry unfurled

Botanical tricks include adhesion and bubbles to spread their spores into the environment.

Physics

Water not so squishy under pressure

In planets' cores, molecules may not compress tightly.

Plants

Tree rings’ lack of volcanic signature confuses climate calculations

Humans

Technique may reveal where it all began

A new strategy overcomes a distance quandary as it tracks the origins of widespread phenomena — from an E.