Burr mill

A burr mill is like a big machine that grinds stuff up, kind of like how you grind up carrots in a blender to make baby food. But instead of just chopping everything up really fast, a burr mill has two big wheels with rough edges that turn slowly against each other. When you put stuff between the wheels, they grind against each other and break it down into smaller pieces until it becomes whatever you want it to be, like coffee grounds or flour. It's a really useful tool when you need things to be ground up really finely or consistently, like making your favorite dessert or a yummy cup of coffee.