[paultopia]

A very simple version of this: I used to find that my macbook was randomly going to sleep all the time when I was working with it. Eventually realized that it was because I was using my ipad pro right next to it, with its very strong magnets for the smart keyboard---and magnetic sensors are also how the macbook tells the screen is closed. Could probably put one to sleep by just waving a sufficiently strong magnet in front of it...

[wtracy]

There was a story on HN at one point about laptops that would immediately go dark when placed on top of another laptop.

The magnet in the lid of the bottom laptop would put the top laptop to sleep.