In the April 29 SN: Proton puzzles, venomous swimmers, seeking early signs of autism, maximum entanglement, cephalopod intelligence insights, glass frog mothering techniques, Einstein on TV, touchy tyrannosaurs, seeing cells in 3-D and more.
HIDE AND SEEK Zika virus (red) remains in the central nervous system much longer than it does in the bloodstream, which could help explain its effects on the brain.
SNOOZE NOW OR LATER Late afternoon naps can push back bedtime, but naps probably don’t affect the total amount of sleep a toddler gets in a 24-hour period, a study suggests.
WOMB WITH A VIEW A lamb at 107 days of gestation (left) — equivalent to about a human fetus at 23 to 24 weeks gestation — matured normally in an artificial womb. Right is the same lamb 28 days later. Such devices may one day help premature babies survive outside the bodies of their mothers.