Does solid fat float in liquid fat?
I thought this question was a good idea for a home experiment to do with my 8th grade son.

Into a block of dry ice, we carved a conical mold hole with the pointed end of scissors and poured canola oil into the hole:



We covered this with a second block of dry ice for about a minute and extracted the frozen oil with forceps:



Then we dropped the frozen oil into a jar of liquid canola oil:



And it sank.