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" ... But you don't have to travel at near light-speeds to experience time dilation. Even ordinary running will create the effect -- potentially causing you to age hundreds of picoseconds more slowly than your neighbors. But how can you determine exactly how much more slowly you're aging? ... "
" ... all of which exist so long as there's enough energy (E) to create these particles of given masses (m) via Einstein's E = mc2. Particles get mass just 100 picoseconds (10-10 s) after the hot Big Bang begins, but there are no protons or neutrons yet. ... "