Remember the solar funnel oven I told you about yesterday? Now the BYU professors that invented it have come out with an update. They tell you how you can reverse the heat flow at night and it will freeze water, even if the outside nighttime temperature is 60 degrees! And even if the nighttime temperature was above 60 degrees, the food you put into it at night will be 20 degrees cooler, so it acts as a refrigerator.
Think how happy that would make you when we are out of power in the hot summer after a hurricane!
(Remember to print out this document, because when you really want these instructions you won't have any power to look at your computer.)
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