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(recipe, Jackie Varriano)
The big difference between corn and other poppable grains is size. Amaranth, quinoa, and millet grains are much, much smaller than popcorn kernels, and their size doesn’t change much even after popping. Sorghum is a little different, but it's still a very quiet experience compared to popping corn.
If your grains don't pop, they may not be fresh enough. (Yes, they are dried grains, but they still need to have enough moisture inside to allow steam pressure to build up inside the kernels, thus producing the little explosion that pops the grain.) Try to buy your dried whole grains from a store with a well-used bulk section, so that the grains are fresh.