Ankle Holsters offer one unique advantage for defensive firearms carry, as they place your defensive tool in a location that most people do not think to look. Danny Pieratti prefers ankle carry and demonstrates proper presentation from that position in this video.
Rob Pincus discusses zeroing your home defense long gun optic and why the normal rules of The Plausibility Principle are trumped by the efficiency of zeroing your rifle for much further distances than you would most likely be using it.
Old-school thinking held that if a tourniquet were used on an extremity wound, the injured person would lose that limb. That has been shown to be incorrect, and tourniquets are now in the first-aid kits of medics on battlefields and streets worldwide.