Earlier today I set you three symmetry puzzles. Here they are again with solutions.The most entertaining way to solve these problems is to cut the pieces out of paper and do the rearranging by hand. However, a generous reader made an interactive version availa... More »
A sharp increase in hardware orbiting Earth could mean more harmful metals lingering in the atmosphere, according to a new study.Low-Earth orbit, a layer of superhighway that wraps around Earth’s thermosphere some 200 to 600 miles above our heads, is newly con... More »
By Joshua Hammer Photographs by Gena SteffensIn the steamy heat of afternoon, Yamit Diaz Romero steered our motorized longboat around overhanging bamboo branch... More »
Today’s puzzles are of a piece. Two, three, and five pieces, to be exact.In each problem you are presented with a set of non-symmetrical shapes. The challenge is to rearrange them without overlaps so the combined shape has a line of symmetry.1. Triangle twinsV... More »
Open Extended ReactionsFRANKFURT, Germany -- So now we know that Germany have a Plan B, and it's called Niclas Füllkrug. After the Borussia Dortmund forward headed home a stoppage time equaliser to salvage a 1-1 draw against Switzerland and keep the Euro 2024 ... More »