Cracking an eternal puzzle

摘要

Advances in physics often result from observations that don't fit theory: the Michelson-Morley experiment, for example, saw no universal ether, paving the way for Einstein's relativity.That successful theory is itself hard to square with one of the most universal observations of all. Relativity, and many subsequent physical theories, kill off the notion that time flows - but every human alive will argue otherwise.