In the Sept. 16 SN: Flexible brains learn with ease, making fair-minded machines, learning research hits classrooms, reading dodos’ bones, new battle of the sexes, tiny antennas, Southern Ocean upwelling in 3-D, black hole census and more.
Footprints left in volcanic ash that
fell in central Mexico’s ValsequilloBasin
about 40,000 years ago are evidence that humans have inhabited the Americas
far longer than previously confirmed, a new study suggests.