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PAIN, NO GAIN  Pain made female mice less interested in sex but had no such effect on males, a new study finds.

BATTLING BACK  Antibiotics such as penicillin attack a bacterium’s cell wall, bursting it (left, shown next to an intact Staphylococcus aureus cell in false color). Some studies suggest that antibiotics also trigger other kinds of damage that could be harnessed in the battle against antibiotic resistance.

MAGNIFYING STAR   A white dwarf, the core of a dead star, contorts the light of the sunlike star it orbits, as seen in an artist’s illustration. The white dwarf’s gravity amplifies the light from its companion each time the white dwarf passes between the other star and Earth. 

DEFINING A KINGDOM  In the peculiar, shape-shifting world of fungi (Erysiphe guttata shown), a rebellion has broken out against the traditional way of naming species. 

RING REMNANTS  The mighty ridge adorning Saturn’s moon Iapetus has steep slopes, which researchers suggest is a sign that debris falling from space stacked up and formed mountains on the moon’s surface.



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