4) Ten-year D cells don’t always live up to their name. In a 16-pack, I typically find at least one that is below operating voltage. Now, before going to the trouble of loading 4 new cells into the lantern I use one of those cheap (red) multi-testers from Harbor Freight to ensure each battery indicates slightly above its rated 1.5 volts. In my experience, if any of the 4 batteries indicates 1.25 volts (or thereabouts) the lantern won’t turn on.
For global catastrophic risks the costs of food storage become impractical for most of the population  and for some such catastrophes conventional agriculture would not function due to the loss of a large fraction of sunlight (e.g. during nuclear winter or a supervolcano). In such situations, alternative food is necessary, which is converting natural gas and wood fiber to human edible food.
World tensions are at such heightened levels that even hedge fund managers and Silicon Valley titans are preparing for the worst. But some of the 99% might need “prepper” shopping tips, too. And even if you’re not inclined to start hoarding supplies any time soon, some of the gadgets below can be useful in all sorts of emergencies, like natural disasters. Good luck out there.
Pense tells me this sitting beside the fireplace that heats the furnace-less cabin, necessary in the damp 40-degree weather. He wears a Realtree camouflage jacket, circular wire-framed glasses, gray slacks and black leather shoes. A sign above the fireplace reads: “Invest in precious metals. Buy lead.” Carved in a split log on the mantel is, “A country boy can survive.” The guttered roof deposits 30,000 gallons of Ozarks rainwater into storage tanks outside each year. It’s a prepper’s paradise.
I'm not quite crazy enough to say that epinephrine will help you survive the inevitable zombie apocalypse (you can go here for that). I'm just suggesting in a roundabout way that if you happened to be in a situation where something was trying to eat you, the increased heart rate and blood flow to your muscles brought on by a well-timed dose might just save your life.
What’s the bare minimum you need to navigate across land? For most people, that would be a compass and map. A basic road map is sufficient to get a rough approximation of the lay of the land. More detailed relief maps can help plan for elevation and estimate possible water sources but they also take up more room in your pack. Waterproofed or laminated maps are also extremely helpful. Lensatic compasses are the most reliable for little money. If possible, a compass and protractor are also extremely helpful for route planning. Obviously, not as essential but nonetheless useful.