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Genomes from thousands of ancient individuals show how migrations helped shape Celtic and Germanic languages — plus, how the brain may regulate emotions differently than we thought.
The duration of short ångström-wavelength X-ray pulses, which lasted merely 170 attoseconds, has finally been measured accurately. The optical system designed for precision pulse duration metrology can be used as a ‘stopwatch’ to measure the rapid motion of electrons inside atoms and molecules, too.