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kidney stone slice

JEWEL BOX Shining ultraviolet light on this thin slice of a kidney stone reveals layers of crystal growth (green and light blue) interspersed with large gemlike structures (dark blue) that show where the stone has dissolved and regrown.

human skeletal stem cells

BONE TO PICK When transplanted into a mouse, human skeletal stem cells produced bone (yellow), cartilage (blue) and spongy bone (red).

drugs

NOT JUST ONE The drug overdose problem is bigger than any one drug, according to a new analysis of the overdose epidemic from 1979 to 2016.

African elephants

AT RISK  African elephants, like those shown here in Kenya’s Amboseli National Park, are at risk of extinction because of the ivory trade.



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