Did you know that those little cups of half-and-half, the ones that are non-refrigerated… the contents sink in coffee if you freeze them.
You should send that in to the Letterman show as a suggestion for the “Will It Float?” feature. Dave almost always guesses that something will float, especially if it’s in plastic.
Well they might float in plastic, I took them out first.
The half-and-half ice cylinder (well it’s not a cube) sank.
Half-and-half is mostly fat and water. Water ice floats in coffee. Fat floats in coffee. I really don’t know how frozen fat suddenly stops floating and brings the water down with it.
It sounds like you have something other than the normal laws of physics working here. I have some numbers you can call.
well, half&half (aka 1) sinks too, so…
Most liquids become denser and sink when they get colder. Ice is one of the few exceptions.
Hm, I just assumed that since milkfat floats that frozen milkfat wouldn’t densify enough to sink.
Funny how nobody yet questioned WHY did I make frozen half and half cups and coffee?
I have a feeling I might regret this, but…
Okay, groman, why did you? 
I don’t know, I was hoping somebody on this board could help me understand.
Honestly, in the break room we have 1% milk in the fridge and those little unrefrigerated half-and-half things in the cupboard. The espresso maker, as one might expect, makes piping hot espresso, and I like my espresso with half-n-half (fine, make fun of me, but I’ve got the taste for that and it cuts down on the stomach problems) but half-n-half is too warm to make the coffee instantly drinkable temperature, so I’ve been using 1% which doesn’t taste as good.
So… I froze some half and half.
Boring? Maybe…
Now I am disillusioned. I just assumed you were conducting an interesting science experiment.
Jim