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.
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.
M. Liebeke et al/Nature Communications 2015
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.