The scale invariance in branch diameter dictates how much smaller a limb should be as it branches and how much investment a tree makes in a few thick branches versus many thin ones. Trees have evolved ...

An exhibition at the Hammer Museum shows why. By Siddhartha Mitter A jury found them guilty of conspiring as part of a crew to steal art, sports memorabilia and artifacts from smaller museums.

From home assistants to advances in heating and cooling systems and from robotic vacuum cleaners to voice-controlled lawn mowers, here's where you can stay abreast of the latest home automation ...