Geologist Maria Brumm has made a compelling argument that ice cream is a sort of igneous rock. Waitaminute! We've been eating rocks?
Here's the basis of her argument:
Ice cream is an igneous rock. You begin with a liquid slurry containing a hodgepodge of chemicals, and by bringing it below its freezing point, you create something solid - or at least solid-ish. Good ice cream or sorbet needs a little give, a bit of liquid remaining between ice crystals so that you can comfortably dig into it with a spoon.
(Image: Maria Brunn)