9 Holding a magnet close to your computer will erase all of its data.

This technically isn't wrong — you may remember how easy it was to wipe a floppy disk using a magnet back in the day. But you would need a really, really big magnet to wipe out your computer's hard drive. Experts told PCMag that hard drives on modern computers would only be susceptible to really strong magnets with really focused magnetic fields. So your average refrigerator magnet wouldn't do the trick.