Buy the 2015 Old Farmer's Almanac!
I don't know how you areI don't know how you are 'cracking' the seeds(kernels)in half, but if you split them in the center you should see something resembling a spoon, fork, or knife. Please refer to the photo on the Almanac site.

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats