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.
PRIMITIVE FISH Polypterus (shown) is a living member of a large group of vertebrates called ray-finned fishes. New evidence suggests that ray-finned fishes arose about 360 million years ago, after a major extinction event, then their diversity exploded.
Matt Friedman/Univ. of Michigan
RHINO TWILIGHT As woolly rhinos dwindled to extinction, their odds of having odd ribs attached to their neck bones may have risen. Here, one of the creatures is shown in a wall painting at Chauvet-Pont d’Arc Cave in southern France.
SUMMER OF DANGER Mother and chick dodos, illustrated here, needed to eat well and get healthy before the stressful cyclone season, according to a new reconstruction of the extinct bird’s life.