I too watched veritasium today

They meant to say you interpreted the comment incorrectly, but that got autowronged to “commenting correctly”.

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They mean outrun in terms of acceleration/speed in a straight line, not outlast

The radioactive source isn’t used for power in smoke detectors, it’s used to detect smoke. What small scale devices use radioactivity actually for power?

Some phones can already do that, like wireless powershare (Samsung)