Are cats solid or liquid?
This is an unsolved mystery that has plagued mankind for centuries.
When you put cats in any container, they will fit perfectly. There can be a box of cats, a bowl of cats, or even a cup of cats. Fardin, a French scholar, once proved that cats are mysterious substances with solid-liquid duality through the Deborah number in rheology, and won the 2017 Ig Nobel Prize in Physics. [1]