spiral galaxy UGC 9391

UNRULY UNIVERSE  Different methods for measuring the universe’s expansion rate disagree. To make one such measurement, scientists observed Cepheid variable stars and a type 1a supernova in the spiral galaxy UGC 9391 (shown), located 130 million light-years away in the constellation Draco.

wolf lichen

WHAT’S IN YOUR LICHEN?  A wolf lichen (Letharia vulpina) is one of the species making scientists rethink more than a century of assumptions about what’s in a lichen.

honey hunter in Mozambique

HONEY HELPER  A honey hunter in Mozambique holds a captured honeyguide on his finger. New research finds that honeyguides lead honey hunters to bees’ nests after hearing the humans make what amounts to a “join the hunt” call.

Alzheimer’s plaques in human brain

PLAQUE FIGHTER  A long dose of antibiotics reduced Alzheimer’s-related plaques (shown here in a human brain) in the brains of mice, results that suggest gut bacteria can influence the disease. 



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