Illustrations by R. Kikuo Johnson
A mid-Cretaceous beetle had a cavity filled with hair at the base of its mandibles for collecting pollen from plants known as cycads.
Alfalfa leafcutter bees and their brood cells in a hut built by Jim Watts, who runs a business providing bees to farmers out of Ontario, Ore.
Sandy was a lab chimp, now retired at Chimp Haven in Keithville, La. The N.I.H. is deciding whether old, ill chimps formerly used in research should be moved to sanctuaries like Chimp Haven, or retire in place.
Juul is under federal investigation for marketing its discreet, flash-drive-resembling e-cigarette product to youth.
An assortment of zebra finches studied by Sarah Woolley, a neuroscientist at Columbia University. Dr. Woolley found that finches were expert at learning the songs of their fathers for later in life, when it comes time to find a mate.
The distribution of the sweet potato plant has baffled scientists. How could the plant arise from a wild ancestor in the Americas and wind up on islands across the Pacific?
Europa, one of Jupiter’s larger moons, lower left, and the shadow of Io, another moon, upper right, are joined by 12 recently discovered moons orbiting the solar system’s largest planet.
A European rabbit. A new report debunked the long-held scientific tale that rabbits were domesticated in 600 A.D. because a pope declared their fetal meat to be like fish and therefore O.K. to eat during Lent.
Wild dogs, apex predators missing from Gorongosa National Park for decades, have been reintroduced and are slowly making a comeback, part of an ongoing experiment in reviving the park ecosystem after years of devastating war.
A helicopter from the nearby Chinese icebreaker Xue Long arrived to pick up the first batch of passengers from the stranded Russian ship Akademik Shokalskiy.
Carl Hart, an associate professor at Columbia University, is the author of the book “High Price,” a mix of memoir and scientific research about drug addiction.
Icebergs near Greenland's glaciers, which are speeding up as the climate warms.
A piece of plastic polymer about to be destroyed under ultraviolet light.
S. Alan Stern, center, New Horizons’ principal investigator, surrounded by children at Johns Hopkins University Applied Physics Laboratory in Laurel, Md., on Tuesday.
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