Everyone loves ketchup, but there’s nothing more annoying than spending five minutes attempting to get the ketchup out of one of those classic glass bottles. It takes forever! By the time it comes out, your fries are cold.
Why is that? Why is ketchup so hard to pour?
George Zaidan of TED-Ed explains in this educational animation that ketchup is a non-Newtonian fluid and has a very complex viscosity.