If you wear glasses, you've probably tried every trick in the book to try to improve your vision when you can't find your glasses. From squinting to holding up a piece of paper to your eye, they all work to a point, but Minute Physics says that using your fist works best.
The basic idea here is that when you use your fist like a pinhole camera, it focuses the light so your eye doesn't blur the objects. Obviously, this is only helpful in a pinch, but it works a lot better than using your mobile phone if you need to track down your glasses.
How to See Without Glasses [YouTube]