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illustration of a woman

MENOPAUSE HEATS UP  Sixteen years ago, study results pushed hormone replacement therapy out of favor as a remedy for hot flashes and other menopause symptoms. A new look at the data says some women could still benefit.

daphnia

SPIKES OUT  Tiny lake dwellers known as water fleas (Daphnia pulex shown) raise spiky defenses when sensing predators nearby. But high levels of carbon dioxide in lake waters may dull their senses, leaving the critters open to attack.  

Streptococcus pyogenes

BUGGED  In this scanning electron microscope image, Streptococcus pyogenes bacteria (yellow) are shown on top of a white blood cell. Different strains of the bacteria trigger a different reaction from the immune system thanks to extra genes that vary among strains.

dead stars illustration

TRIPLE THREAT  A threesome of dead stars has allowed a new test of a tenet of Einstein’s theory of gravity. The trio includes a pulsar (illustrated, with bands of electromagnetic radiation in blue) in orbit with a nearby white dwarf. A second white dwarf orbits farther afield (red, upper right).



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