You might store your most precious memories in diary passages or in photos backed up on a hard drive. But thanks to physics, no memory can last forever—not in a diary, not in a hard drive, not even in your brain. If you could live forever, you would eventually forget everything.
This happens because every possible structure for storing memories has to hold something in place. That thing could be ink or little magnets or special molecules called neurotransmitters. But no matter what that thing is, it’s getting bombarded by molecules around it. After enough time, those molecules will eventually dislodge whatever is holding memories in place.
Find out more in the latest episode of What the Physics?!