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How to pronounce "femtoseconds"

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will have aged 10 femtoseconds less than your head. On the other hand, GPS satellites high

3 Simple Ways to Time Travel (& 3 Complicated Ones)

Duration: 5s Details

a walk around the block, you'll be 3 femtoseconds younger than your friend who stayed home.

3 Simple Ways to Time Travel (& 3 Complicated Ones)

Duration: 5s Details