MathematicsMaths quirk explains why crosswords are so hard – until they aren't The process of solving a crossword puzzle is mathematically similar to well-studied physical systems – but one property makes the game unique 51¶¯Âþ
PhysicsThere may be a cosmic speed limit on how fast anything can grow Alan Turing's theories about computation seem to have a startling consequence, placing hard limits on how fast or slow any physical process in the universe can grow 51¶¯Âþ