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

The talk/variety series “Real Time with Bill Maher,” hosted by Bill Maher, has been running for nearly two decades now, and is showing no signs of slowing down. In fact, HBO has already renewed the ...

However, achieving this universally accepted “order fairness” is fundamentally impossible unless it is assumed that all nodes can communicate instantaneously (i.e., operating in an instant synchronous ...

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