What are some small facts that might save your life one day?

Here's a few I've learned in my lifetime:

1. In almost every case of someone being saved by paramedics where the patient's heart had stopped, someone was giving them CPR. Teach people around you how to give CPR properly, and you are significantly more likely to survive such an event. Don't do mouth-to-mouth unless there are two people, as chest compressions are exponentially more important.
2. Don't forage for food if you're lost, find water and shelter and stay put. You're more likely to eat something poisonous and you can survive for days without food. You're also more likely to get more lost if you move than stay put.
3. Swim along the shore, not towards it, if you're in a riptide. Float if you get a cramp.
4. Stop the bleeding, don't tourniquet it. Wrap it, put on pressure, lean against a wall, whatever it takes to stop the bleeding. Even 9 out of 10 gun shot victims survive, so long as they stop bleeding. Improper tourniquets cause amputations.
   
5. Learn how to use a tourniquet properly. Tourniquets can save lives, with little risk, but only if you know how to use one. If you don't, you're going to either lose a limb, kill your kidneys, or bleed out from improper care. Try everything possible to stop the blood beforehand.
6. Put something between you and the impending explosion. Anything at all. Line of sight means likely death. Even if it's only a few feet away, you are much more likely to survive with something else in the way.
7. Keep maximum-strength antihistamines in your wallet when taking a hike in case of stings, bites, etc. You never know when you'll find something you didn't realize you were allergic to.

Edit: I have added #5 after it was made clear to me that I appeared to be suggesting that you should never use a tourniquet, which was not my intention. However, this answer was written for 'how to save your own life.' It's usually inadvisable to tourniquet yourself.

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