In Black Mirror Season 1, the third episode centers around a contact lens that allows us to constantly capture video of everything we see -- enabling us to, among other things, retrieve any memory on demand. Needless to say if you've ever seen Black Mirror, things get bleak, fast.
A tiny augmented-reality wearable like this is still a long ways away from becoming reality (although, Google does have a patent for something scarily similar). In the meantime, a brand-new free app just launched that does essentially the same thing on your computer and phone. It's called Recall, and it records every single web page, email, text, picture, document, song, video, tweet, chat, Facebook post, or other piece of content you look at on your screen. The goal? To make searching for and retrieving information as natural and effortless as possible.