This video from the American Chemical Society explains the science behind life hacks such as using salt to fix bitter coffee. It also introduces us to a new one: easily getting the rust off cast iron with cola.
Coke, the video reveals, contains phosphoric acid, which is used industrially as a rust and tarnish remover. It makes the rust easier to remove. So if you ever accidentally leave your cast iron pan covered in water, just grab a bottle of Coke and get your cast iron looking brand new again (after you seasonthe pan, that is).
Thank you, chemists.