ice cream
Dr. Free-Ride: Do you remember what [Dr. Free-Ride's better half] said we were going to do at some point this summer? Using the machine in our garage that Uncle Fishy and RMD left for us?
Younger offspring: That ice cream machine?
Dr. Free-Ride: Yeah.
Younger offspring: Oh, I love that!
Dr. Free-Ride: Well, what are we going to do with it?
Younger offspring: Make ice cream.
Dr. Free-Ride: Do you know how making ice cream works? Or can you tell me your theory about what's involved in making ice cream?
Younger offspring: Well, I think there's, like, this thing ... in the machine, you put ice…
I was struck by the similarity of these two images. Which one does your dentist want you to eat?
I won't speculate about anyone's dentist's motivations, but the top image comes from The Science of Ice Cream, and the bottom from the USGS. I'm not sure what conditions the ice cream was stored under, but the USGS image is from a limestone that had been stored next to a piping hot intrusion of monzonite, and partially baked into marble.
Frozen desserts left in the freezer too long will undergo a similar process. The edges of each ice crystal are constantly exchanging water with the sugar…