Larger models can pull off a wider variety of feats, but the reduced footprint of smaller models makes them attractive tools.

A buoyancy problem involving a ping pong ball, an iron ball, a few strings, some water, and a set of scales is causing a few arguments on Reddit where it was posted. "Where would the scale tip?

While the study’s conclusions aren’t surprising, its scale and comprehensiveness are remarkable. “It’s a spectacular article in terms of magnitude,” says Salvador Macip, a researcher on aging, who was ...