Long before toxic chemicals and high-tech tanning solutions, our forebears tanned animal hides using the naturally occurring oils in the animal's brain. The brain of every animal contains an adequate volume of conditioning oils (unless it's a whale or something) which can be used to tan the hide. All you need is your animal hide, the brain of the animal, and a few tools to make tanned pelts and leather just like our ancestors. Yes, it's a laborious skill to practice (not to mention smelly), but if you use brains instead of brawn, you can turn out buttery-smooth, super-soft buckskin. So to make your life easier, here are three tricks for easier brain tanning with deer hides.