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My parents (and grandparents, I think) used to put batteries in the fridge. I did too, until I learned that it’s not a good thing to do. Something about the humidity.
I do freeze bread. Mainly because the bread I can eat (gluten free) is expensive and not easy to get in the size I like (there are sizes!), so I buy multiple and freeze the excess. I also freeze my ground coffee (I really should start grinding my own; with the horror stories I’ve heard about pre ground…). I do refrigerate butter, jelly, ketchup, mustard, mayonnaise, and hot sauce.
¯\_(ツ)_/¯
Batteries it depends on the chemistry.
NiCad/NiMH and some other older battery tech it can prolong shelflife, especially if you're in a hot/humid climate. Lithium batteries it doesn't really do anything.
Meaning it's a mostly outdated tipp.
Mostly outdated, but not "throw coins in aircraft engines" crazy. It's at least based on good advice, just a bit cargo-cult-y.
WhoTF is not refrigerating mayonnaise?
Ah, about ground coffee.
Summary: a fatty substance containing cafestol (raises LDL cholesterol only in humans) gets hold back by paper filters but not by French press, Turkish and boiled coffees, or coffees using mesh filters.
This I knew. It should also be noted that when you use anything other than a paper filter (those reusable brass mesh ones), then you risk higher ldl cholesterol; not just French presses.
I got a cheap [electric] burr grinder a while back ($40 I think?) and it's a wonderful thing. Being able to choose your grind to your own taste is a wonderful thing.
Edit: If you're on the fence, you can get an even cheaper ($10) hand burr grinder to see if you like it. Definitely worth a try.
I'm on a keto diet right now, and while keto bread is an amazing innovation that's made it much easier than the last time I did this, I have to keep that shit in the freezer because it seems to get moldy a lot faster than normal bread, often well before the expiration date.
My grandparents would throw dying batteries in the freezer. They swore they’d get “more juice” out of them that way. No idea if it actually did anything.
I was told to warm them up to get the last bits of juice out of them while camping. Wonder which it is?