Comment on Electrons are easy

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merc@sh.itjust.works ⁨5⁩ ⁨months⁩ ago

That’s not a good analogy because typically cameras don’t change the things they’re observing. But, a camera with a flash…

Imagine a guy driving down a dark road at night. Take a picture of him without a flash and you’ll get a blurry picture.

Take a picture of him with a powerful flash and you’ll get an idea of exactly where he was when the picture was taken, but the powerful flash will affect his driving and he’ll veer off the road.

You can’t measure something without interacting with it. This is true even in the non-quantum world, but often the interactions are small enough to ignore. Like, if you stick a meat thermometer into a leg of lamb, you’ll measure its temperature. But, the relatively cool thermometer is going to slightly reduce the temperature of the lamb.

At a quantum level, you can no longer ignore the effect that measuring has on observing. The twin-slit experiment is the ultimate proof of this weirdness.

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