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researcher inside KATRIN

MASSIVE MACHINES  A researcher stands in the cavernous spectrometer of KATRIN, an experiment in Germany to measure the mass of particles called neutrinos.

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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