This is the Fourier Transform. You can thank it for providing the music you stream every day, squeezing down the images you see on the Internet into tiny little JPG files, and even powering your noise-canceling headphones. Here’s how it works.
There's a baby crying next to you, and it's extremely annoying. You hate it. It's a cute baby, but come on, you're trying to sleep on the train. Luckily, math (and tech that uses it) can wipe the baby out.