None, because knowledge and the search for it is an end unto itself, so all facts are useful to learn and know.

Like 15% of people can rumble their ears and make a sound only they can hear

I'm convinced people that "can't" just don't know how.

It's the same movement as closing your throat off so you can open your mouth underwater, and you just push "up" past that till it puts pressure on the eustachian tubes, and the rumble is your muscle fibers contracting against that which resonates on your eardrums.

Anyone can do it, it's just hard to explain

The "brat" in "bratwurst" doesn't come from "braten", which means to fry. It actually comes from the old German word "brät", which means finely chopped meat.

If presented with an old 1970-2000 era landline phone, I can call someone by rapidly hanging up in the pattern of their phone number.

I am pretty sure I could do it sans phone and only the handle, by rapidly pulling the plug out of the socket and putting it back in.

Never thought to try it when I had the chance.

Fair enough, but what is the least useful fact you know?

Used to do this in payphones as a kid. The numpads were disabled when no coins were inserted, effectively disabling tone dialing. But pulse dialing still worked.

I always just assumed this was a thing anyone could do, Is there some other name for this i can look into?

Auto-Earatic Affixation

"Loanword" is a calque, and "calque" is a loanword.

My newly least useful fact is that knowledge and the search for it is an end unto itself, so all facts are useful to learn and know.

Voluntary control of the tensor tympani muscle.

Alaska is the eastern most state of the USA.

That's a minor sound when I do it if I understand correctly. Audible but light. I can flex the muscles in my jaw/tongue as one would to attempt to pop ears, but pushing out from the back of the mouth and pulling my jaw backwards. I think it slightly restricts blood flow and makes it turbulent past the ear. Sounds like pulsar tinnitus (probably not relatable) but constant as long as I hold it.

Yeah, that's it.

I think some people just do the "water lock" thing to close their jaw off naturally to try and stop a yawn, and that's how they "discover" they can do it.

That's so brät

Yeah, but it settles in its final location to the south...

The sun will explode. Eventually. Interesting and fascinating, yes. Useful? Nope.

I am not sure what that means. Does that mean it is also the southern most state?

But wouldn't it be useful if I can use it here?

An electric eel is not an eel.
A mountain goat is not a goat.
A maned wolf is not a wolf.
A mountain chicken is not a chicken.

Also, there is an animal called the Headless Chicken Fish.

It's the edge of the world and all of Western civilization

The sun may rise in the East, at least it settled in a final location

It's understood that Hollywood sells Californication

https://www.youtube.com/watch?v=YlUKcNNmywk

The joke being if Alaska is "The east" it's where the sun rises, then goes 99% around the planet to Cali

Are you this person who, at the family gathering, will loudly decline words in a long dead language they forced you to learn 50 years ago, just to call it useful?

The Hawaiian Island chain is a lot bigger than most realize and stretch for miles and miles but the Alaskan Island chain actually goes over the International Date Line. That is what makes it the “eastern” most state.

rats can't vomit

flamingos are pink due to diet. otherwise they'd be grey

The synths that were used in the first doom reboot's music were made from samples of an actual chainsaw running.

There are several rivers in England called the Derwent.

One of them flows into the Ouse in Yorkshire, another flows into the Trent in Derbyshire, both of which later combine to form the Humber estuary, so the Humber has two Derwents in it

I know how to fix the entire world.

Everything flawlessly. Human satisfaction at all time highs.

So much so that the largest problem that humanity would face is the ennui of not knowing what to do with itself.

Also, there is an animal called the Headless Chicken Fish.

Let me guess; it's a species of antelope.

A koala is not a bear.
It is a marsupial which is a different branch of the mammal tree.

Rocky Mountain oysters are not oysters

Cheese is unhealthy for mice.

For 27 years I have been singing this as "at least it settles in a _fun_location", like "you guys may get the sun rise but of course it wants to settle down in California" and I thought that was such a clever line.

Now I don't know how to feel.

Grostesques are mythical or fantastical creatures carved into the sides of building. If they have been designed to drain water away from the building, they are called gargoyles .

Especially when attached to mousetraps.

A lot of 90s music sounds deep because we attribute meaning to it and our memories of the times...

Then you see the lyrics and nope, it was just the heroin

The most efficient base is the number e

As to why this is a useless fact:

Even if I'm 100% correct, nobody wants to hear it.

No one will work with me to accomplish these things.

All this knowledge does is add misery to my own life, knowing that I could make things better if only.

Often the rj-12 handset cabling would not plug directly into the rj-11 jacks. If they did, I'd be surprised to learn they'd work on the wire as-is.

Mine sounds like a snare drum.

If you put enough energy in one place it will cause a black hole. This type of black hole is called a Kugelblitz.

Current graphics cards do not yet use enough energy to worry about a kugelblitz occurring in the 12-pin connector.

The Moon is much further than you'd intuitively assume. In fact, you can fit every other planet in the solar system between the Earth and the Moon. At the same time.

The closest US state to Africa is Maine

One of the people that worked in Turkish translation of the "alice in wonderland" for Zambak magazine has the cool birthday "January 1st, 1969."

Yeah, you'd have to change the plug.

I am like 90% sure mice are immune to unhealthy.

I'd argue that's a useful thing to know.

I am currently naked.