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Archaeology

This South African cave stone may bear the world’s oldest drawing

The Stone Age line design could have held special meaning for its makers, a new study finds.

Materials Science

Here’s how graphene could make future electronics superfast

Graphene-based electronics that operate at terahertz frequencies would be much speedier successors to today’s silicon-based devices.

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.