Coffee joulies

Don't you hate it when you leave a delicious cup of tea to steep, and
you either wait too long and the tea is too cold, or you don't wait long
enough and the tea nearly burns a hole through your tongue?

Well, two friends (both named Dave) have just come up with the perfect

remedy for this problem: coffee joulies! Coffee joulies absorb thermal

energy from coffee or tea that's too hot, thereby "cooling it down to a

drinkable temperature three times faster". Then, they release the stored

thermal energy back into your mug to keep your coffee or tea at that

perfect temperature for twice as long! How neat is that?? 

(Images via Lady and the Blog and Kickstarter)