Physiology

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POWER SIP  A new way of looking at hummingbird tongues says they work like tiny pumps, challenging the familiar idea that the birds sip nectar by capillary action. 

Earthworm

SELF-DEFENSE  Using cross sections of earthworms, researchers discovered in the gut a group of compounds called drilodefensins that foil hazardous plant chemicals. The colored scale shows relative abundance of the drilodefensins in the worm.

Ethiopian highlands

Over millenia, humans have adapted to the high altitude of Ethiopia's highlands. Researchers have now pinpointed one adaptation — lower levels of cardiac signaling protein — that may make the high life possible.

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