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London Underground begins scanning passengers' faces(btp.police.uk)
356 points by BlueBerry2001 | 438 comments
British Transport Police news release about expanding its live facial recognition trial into London Underground stations; the capture shows a Cloudflare verification page.
Why does kinetic energy increase quadratically, not linearly, with speed? (2011)(physics.stackexchange.com)
354 points by ProxyTracer | 195 comments
A Physics Stack Exchange question from 2011 asking why kinetic energy scales with the square of speed rather than linearly; the capture shows a bot verification page.
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