25 electronic gifts under $100 for teens and tweens: Shop our top picks from gadgets to accessories

Shop the 25 must-have electronics for teens and tweens, including light strips, screen magnifiers, and AirPods.
The Debrief

“Targeted Ultrasound Echolocation” Inspired by Bats is Helping This Engineer Develop Tiny Flying Robots That Navigate in Total Darkness

A robotics engineering professor is building tiny, autonomous flying robots that can use sound waves to navigate in total ...