Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. What is Bluetooth? – Henry, age 13, Somerville, ...

Bluetooth headphones are a staple of the on-the-go listener, adorning travel bags and commuter setups around the world. But you may have heard speakers or headphones referred to as "wireless" before.

Imagine heading out for a jog, commuting to school, or simply chilling at home—all with your favorite music or podcast keeping you company, wire-free. Wireless Bluetooth earbuds have made it super ...