D:Please help me? *begs*

Okay, so I have the strangest science teacher you will ever meet.

I have to put an ice cube in a closed box/thing and have it not melt after 40 minutes.

I had an idea of wrapping tin foil around a glass jar, but you can't use anything pre-made. [The jar is premade]

Anyone have any ideas at all? D;

It's a grade...for every gram of water that melts, you get a letter-grade lower.

*Punches self for being in honors science*

Of course I wait until the night before its due, what did you expect?

*Goes to start book report while waiting for any replies*

Gahhh.

Anyone? Ideas?

:[