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Science & SocietyThe U.S. empire was built on bird dung
A mid-1850s act let the United States seize islands rich in bird guano. Those strategic outposts fueled the U.S. rise to power, a researcher says.
By Sujata Gupta -
AnimalsThe ‘Mekong ghost’ megafish has resurfaced after an extinction scare
Rediscovery of giant salmon carp in Cambodia sparks hope for the rare fish’s survival and efforts to conserve one of the greatest diversity hot spots.
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LifeHow insects can help catch rhino poachers
A new study looks at which insects can be used as biological clocks to determine when a rhino was killed.
By Jude Coleman -
SpaceA near-Earth asteroid offers clues to one dark matter theory
Data from the OSIRIS-REx mission to Bennu place a ceiling on the strength of a hypothetical fifth force that could explain dark matter’s origins.