A string trimmer is a staple of lawn care, and a useful tool that deserves a home in any DIYer’s garage or shed. With their high-speed and spinning nylon strings, they make short work of grass and ...

String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the most useful sets of tools in science.

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What happens when all of a man's intelligence and athleticism is focused on placing a fuzzy yellow ball where his opponent is not? An obsessive inquiry (with footnotes), into the physics and ...