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

That is well cool

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?

They’ll test it on the ground and flying slowly first before going fast to make sure it’s safe enough.

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