TIL these two guys (see link) flew a clock around the world in different directions and proved Einstein’s theory of relativity – 50 years ago. The airline tickets (the clock needed seats too) and hotels cost $8000.

Read more: https://en.wikipedia.org/wiki/Hafele%E2%80%93Keating_experiment?fbclid=IwAR3sf-y_59vIvjlsIIIlwq1KFSBuSpatE3JubVJ-pNsQdG-kiyWXnKoI9ok

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