Why not use helium, which weighs only one-seventh as much as air, to inflate airplane tires and thereby save precious cargo weight? This idea might have occurred to any ten-year-old, but it remained ...

Helium is a "remarkable gas," says Michael Harper at Red Orbit, used to make everything from telescopes to MRIs run smoother. And when it's time to unwind, we pump helium into party balloons, or ...