Cats fill./ Cats spill./ Cats flow downhill.// Cats tip./ Cats drip./ Cats grip, snip, rip.// Cats are a liquid/ Except when they’re not. Celebrate cats in all their flowing, furry glory! This charming picture book examines the unusual physical properties of felines. Inspired by an Ig Nobel Prize–winning investigation of how cats behave like liquids, it introduces some of the physical properties of liquids - they adapt to fit a container, they flow like fluids - and is just pure fun. Like its inspiration, it makes you laugh, then think. Back matter includes a brief introduction to the different physical states.