You’ll need to be wearing headphones for this to work. Go ahead and grab some, I’ll wait.
Now that you have headphones on, listen to this audio file.
What you’re hearing is an example of binaural beats. There is a tone played in each ear that are just slightly out of tune with each other. This produces the pulsing you’re hearing and the illusion of a third tone. Take one headphone off and you’ll hear just a single sine wave tone.
There are some who claim that listening to binaural beats are a way to “hack” your brain. The evidence for this is spotty, at best, however there is some indication that it might actually have a positive effect on memory. You can try this out yourself. Put that audio file on a loop and while listening to it look through a shuffled deck of cards. Deal the cards face down into two piles, using your instincts to guess which cards are which.
How did you do?
Quirks and Curiosities 