News in Brief

Physics

Sound waves can make bubbles in levitated drops of liquid

A new technique reveals how to make bubbles from droplets suspended in the air.

Neuroscience

How obesity may harm memory and learning

In obese mice, immune cells chomp nerve cell connections and harm brainpower.

Planetary Science

Saturn has two hexagons, not one, swirling around its north pole

NASA’s Cassini spacecraft spied a vortex growing high over Saturn’s north pole, whose hexagonal shape mirrors a famous underlying cyclone.

Genetics

German skeletons hint that medieval warrior groups recruited from afar

Graveyard finds may come from an ancient European warrior household with political pull.