America’s Merriam-Webster dictionary has just added 20 new words, from “air fryer” to “super-spreader”.

One of them is “oobleck”, a non-Newtonian fluid that flips between behaving like a liquid and a solid. It’s named after a Dr Seuss story, and you can make it easily from cornflour and water. Somehow my science teachers never showed me this. Pretty cool.