I was talking hunting with a guy at the bar and mentioned an atlatl (still too stupid for hyperlinks) Spear-thrower - Wikipedia
So what tidbit do you think more people should know about?
Blackberries are red when they’re green.
How to code hyperlinks.
There’s a button where the bold, italic, etc. buttons are at the top of the board’s text entry box. It looks like a small globe with an infinity sign at the bottom (a link of a chain).
Type whatever you want. Highlight the text you want to turn into a link. Click the button. Type/paste in the URL.
It really is that simple.
If you didn’t highlight text, I believe the box asks you what text you want.
Alternately, you can use [noparse][/noparse] tags:
[noparse][this is the text you want to display](this is where the web address goes)[/noparse]
Why should everyone know about atlatls? How many people use spears or darts these days? Now, if someone is interested in primitive weapons, either as a hobby or as part of his/her profession, yes, knowledge of those things is essential. Otherwise, well, it’s interesting to think about at times, but really, when was the last time you NEEDED to know about them?
I think it’s more important to know about compound interest, myself.
Wash your hands after using the restroom. Unless you’re eating jalapenos. Then wash your hands beforeand after.
Barack Obama is an American.
And honey is really bee vomit.
(Learned from Cecil eons ago) 
When I read the OP, I thought, “Yeah! Atlatls are totally cool. More people should know about them!” Then I clicked the link, and realized I was thinking of Axolotls. Now those are kickass.
Axolotls! They’re neotenous! Tell your friends!
How to change a tire on your car.
How to put gas in your car.
That oil changes for your car aren’t just a scam, and should be done regularly.
I seem to be on a bit of a car kick today.
Why on earth should everyone know about this?
Why before?
Owning a horse doesn’t mean you’re a millionaire.
Looking after old people isn’t some fulfilling, rewarding pastime.
I concur. Jalapenos is a tingly bonus. Habaneros are where the real junk-burning occurs.
Get some jalepenos on your hands, handle your private bits for a while, then report back.
Gray does *not *go with beige. I don’t care if they are both “neutrals.”
How to work a butterfly ballot would have been helpful fairly recently.
What a standard deviation from the mean is, and what “statistically significant” means. Well, a lot of other stats stuff too, but we can start there.
If your instrument panel in your car has a picture of a gas pump and an arrow, the arrow is telling you what side of the car the gas tank is on. You’re welcome.
Oh, and your box of aluminum foil or parchment paper or whatnot has little tabs you can fold in to keep the roll in place when you pull out the end.
Boiled eggs should be cracked at the little end.
You can give Benadryl to a Golden Retriever with an allergic reaction to a bee sting, just like you’d give to a human, and save a $200 ‘Emergency Vet’ bill…