Science
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X-rays reveal what the 'oldest reptile' fossil was hiding
Scans of Lizzie, a 345-million-year-old Scottish fossil, revealed internal gills and thousands of tiny teeth, upending its status as an early reptile.
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New fossils push a key human ancestor back 200,000 years
A 2-million-year-old skull fragment from South Africa may be an adult Homo erectus, predating previously discovered fossils by 200,000 years.
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How close did Nazi Germany really come to a nuclear reactor?
Heavy water, graphite, and uranium: the study tallies what Germany had against what a working reactor required, and the numbers fall well short.
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Earth microbes grow in simulated ocean of Saturn's moon
Scientists put an Earth microbe in a lab-made version of the alkaline ocean beneath the ice of a moon circling Saturn. It grew and made methane.
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Astronomers detect radio signals from a planet 64 light-years away
Astronomers traced auroral radio emission to Beta Pictoris b and used it to make the first direct measurement of an exoplanet's magnetic field.
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Google Earth reveals mysterious giant stone circles in the Andes
A climber spotted a vast stone structure on Google Earth, then trekked nearly four days to reach it. Archaeologists don't yet know who built it.
