Today we were lucky enough to make ice cream with our scientist of the week. Did you know that all you need is: an ice cream ball, lots of ice, rock salt, 1 pint cream, 1/2 cup sugar, 1 tsp. vanilla extract, and optionalflavorings like peppermint and chocolate chips. Here's how it works... The salt lowers the freezing point of the ice. Just like when we add salt to the roads in the winter, the ice will start to melt at temperatures about 32 degrees. With a lower freezing point, the ice starts to absorb the heat from the cream, because temperatures always equalize. In the process the cream gets extra cold to form delicious ice cream.