I was looking for a fun way to demonstrate thermodynamics to kids in a class setting. I remembered jumping discs, but could only find them in huge (over 1000 units) quantities everywhere but here....
I am sorry. We made a mistake in picking that item. I have already sent you an e-mail top say that you can keep the item that we sent in error, and that we can either refund you for the missing item, or send one to you.
