String theory aims to explain all fundamental ... added a new piece to this puzzle: They have proven a conjecture related to so-called 4-graviton scattering, which physicists have proposed for ...

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In the case of our 'string around the Earth' puzzle, the radius is being increased by 15cm, so we need to know that as a fraction of the original radius. So what is the radius to start with?

What is Bitcoin? The puzzle encoded a string of binary - a series of zeroes and ones - in complicated rows of flames painted around the edge of the canvas. The colour and shape of each flame ...