Crack A Nut Duyvis

Sure, anyone can open a pistachio with a LeatherMan, hammer, or laser cutter. But without using any of those traditional pistachio-opening tools, and without risking injury of your fingernails, teeth, or your pride, you beat the pistachio at its own game. You got to the prize. Savor the morsel that was previously unreachable by humankind.

Crack A Nut Duyvis Free
Next time you're sitting around with friends eating pistachios, show them this trick.and remember that you learned it on Instructables.
Wild hickory seeds have to survive cold winters to germinate in the spring, which makes their shell nearly impenetrable by conventional nut-cracking means. Although you can't break through the hickory shell easily, you can strike it at the point the six shell segments converge to open the nut. Hickory shells have tough tissue, called septum, separating the two nut 'halves,' which are actually two seeds; if you strike the shell at the lower portion near the stem end, the segments separate, leaving the nuts in a few pieces.
You can also buy hickory-nut openers in specialty food stores.