I do not think that freezing it would make it work again because when you snap the glowstick it breaks a case inside that releases a chemical which causes a reaction to make it glow. It doesn't make sense how freezing it would seperate the chemicals and close them in the seperate cases so that you can crack it again but whatever who knows. I think if you keep it in the freezer then it lasts longer when you finally do snap it because it will be very cold and everyone knows that the colder something is the less energy it has and the slower the molecules move. So the reaction might take place slower and last longer. As for the microwave, that sounds suicidal. It might explode.