A fresh bead of caulk around a bathtub looks deceptively simple when done right. That clean white line seems like it should..

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Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

What makes plants grow to a certain size? From the tiniest cells to whole leaves, roots, and stems, growth has to be ...

A world-famous light experiment from 1801 has now been carried out with sound for the first time. Research by physicists in ...