If your popcorn won't pop, the kernels may have dried out. Soak them in water for about 5 minutes, then drain and try again. Or freeze them for a day or so.
In fact, the freezer is the ideal place to store popcorn - and you don't need to thaw the kernels before putting them in the pan. The additional moisture actually improves their performance.
Unbuttered popcorn has fewer calories than most snack foods. Try sprinkling it with crushed herbs or spices.
