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 ...

And, well, they were slow and easily shot down, by air or by ground forces.

Have you ever noticed that balloons blown up by mouth don't float in the air, while balloons filled with helium gas do float? To understand this question, let's look at why things float. A person ...

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 ...