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Light can travel around Earth more than 7 times in 1 second.

That's 300 million metres per second!
- from Khan Academy

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How batteries work

Duration: 4:19 min

Source:  Accessed: 22.02.2021

Batteries are a triumph of science—they allow smartphones and other technologies to exist without anchoring us to an infernal tangle of power cables. Yet even the best batteries will diminish daily, slowly losing capacity until they finally die. Why does this happen, and how do our batteries even store so much charge in the first place?