One ruler is cooled to liquid nitrogen temperature and another is left at room temperature. The two rulers are compared to show that the cooled ruler has contracted. This demonstration requires ...

wow, that sounds freaking cool! definitely hook us up with video or pics if you get them. not that it will be the same as being there, but still.

Water in an aluminum pop can is heated on a hot plate. When sufficiently hot, inverting the can and immersing the opening in cold water will cause the can to collapse inwards. Hot water vapour cools ...