Boing Boing reader Tyler Bartlett has been trying to understand the odd air pocket in this jar of raspberry jam:
I know this looks like we turned this jam jar upside-down and popped in in the fridge. But we didn't. My roommate brought this to my attention yesterday, and we have no idea how or why the jam is doing this. It did the floating thing yesterday, and when we had it at room temperature for a minute or so, the jam started to fall to the bottom again. We took it out of the fridge today, and again it floats.
How would you explain this event?