In the July 7 SN: The impact hypothesis that won’t die, CAR-T cell therapy upgrades, bad news for Antarctica, a quoll conundrum, honeybees know zero, how volcanoes kill, Jupiter’s polar lightning and more.
EARLY ARRIVAL Researchers excavate a stone tool from 2.1 million-year-old sediment at Shangchen, China. Newly reported discoveries at Shangchen indicate that it’s the oldest known hominid site outside Africa.
TINY WALKER A fossil of an ancient hominid child’s foot (shown here from different angles) suggests that members of Lucy’s species, Australopithecus afarensis, walked upright early in life.
J. DeSilva and Cody Prang
BRAINY CHIMPS Some modern chimps have brain surface features that were thought to have signaled humanlike brain evolution in hominids from as early as 3 million years ago, scans suggest.