A tiny ham-radio transmitter lets you track a balloon globally ...

Anyone who has cleaned a beach can rattle off the head-shaking trash they’ve encountered, from cigarette butts to dirty diapers. But what volunteers sweeping Monmouth Beach found one July day in 2017 ...

It makes sense that a balloon filled with a lightweight gas such as helium would float when surrounded by heavier air. But why does filling a huge balloon with hot air also make it float? This ...