What's your favorite unbelievable fact?

I'm going to flirt with my SO using this now.

Update, they didn't appreciate my affection :(

I'm going to qualify this—all vertebrate eyes have a blind spot. Cephalopods also have eyes that are like vertebrates (this type of eye is called 'camera eyes'), but their eye anatomy is such that no blind spot exists for them.

Piggybacking on your fact about the brain effectively editing what we visually perceive, we don't see our nose (unless you made a concerted effort to look at it) because the brain ignores it.

fun fact: the blind spot is because our optical sensors are installed backwards and that hole is so the optic nerve can pass back through the back of the eye to the brain. some other critters with independently evolved vision systems, such as cephalopods, avoided this particular evolutionary pitfall.

What we consider reality, is a synthesis our brain is presenting to us, it is an approximation..

It's also a coordinated synthesis from all of your input senses (sight, hearing, smell, etc). It also explains why those who have a certain sense stunted (aka blindness, deaf, etc) report having all their other senses heightened. And it's up to the individual's brain to assemble those sensory inputs into a complete picture of the world around them, what we dub "reality." Which then brings into question the nature of common reality, and what defines it. Trippy shit.

Oh I thought my eyes were fucked. I look at a star in my periphery and it's there, I look at it directly and it's fucking gone.

Wait. Please explain. How is DNA inside me, a verifiable human, not human?

And make flower patterns on cloth

And one that loses only 1 second per year is right only once every 43,200 years.

a clock running backwards is moving away from the current time at twice the rate, so isn't your example the same as saying that a clock that runs twice as fast is right 4 times a day?

Both trees?

Had to look this up- you are indeed correct. The North Star is at most 67 million years old: https://en.m.wikipedia.org/wiki/Polaris

Most frequent occurence is the mode. Most ppl have 10. The median is probably 10 as well, while the mean average is skewed down, I would think, by some people losing fingers as the grow. Having extra fingers is pretty rare. So the mean might be 9.95 fingers, just to toss a number out.

For some reason that reminds me of how the first member of the Wampanoag tribe to greet the Pilgrims at Plymouth Colony, named Samoset, spoke to them in English. Then he came back later with another tribe member, Squanto, who also spoke English.

What's the details about a fax machine in the 1860s?

The first time I took mushrooms it had been after reading about this kind of thing for about a week.

I recall reading about a man who was effectively blind but his eyes worked fine. What didn't work fine was the part of his brain that interpreted what his eyes saw. So he just saw smeary streaks of light.

It's kind of like Linux without its V4L2 system for interpreting video capture devices. It can't actually see video without it.

Along those same lines, we're all blind literally around half the time we're awake. Our optic processing system can't keep up with the input as our eyes flit from thing to thing, so we don't see anything while they move. And they're moving constantly, even if we're not aware of it, because only the fovea in the center of the retina has a high enough density of receptors to see details, and also because of sensory fatigue from prolonged static stimulus. In short, we have a tiny field of detailed vision that's not even working much of the time. That field of vision that feels like a 4K video feed into the mind is a complete lie.

Like the way our subjective experience feels like a continuous, integrated mind fully in control of itself, but in reality, consciousness dips out a couple of times every minute while the brain attends to sensory input.

Even weirder, the conscious mind might not even exist, except as an illusory, emergent phenomenon of sensory experience and memory. There isn't a place in the brain where it 'lives', no part that's only ever active when we're conscious.

Therefore a graduated cylinder that is 10m tall needs to resist the same amount of force as a dam 10m tall regardless of how much water is behind the dam. Even a thin sliver of water 1mm thick and 5m tall has the same force as a 5m lake behind the dam.

Technically only the pressures are equal, and the actual force will be linearly dependent on the area of the dam (or the surface area of the cylinder). That's why you can make a tall water tank with relatively thin walls, but an actual dam will have to be quite thicc to handle the tensile/compressive stress (depending on the shape of the dam).

This is also why trees are so fucking crazy to think about. It is impossible to pump water up a hose more than ~32 feet. Like it’s literally physically impossible to stick a pump at the top of a tall building and suck water straight up a pipe. You need a complicated series of pumps and one-way valves to pump it up in stages. Because you’re not really “sucking” the water up the pipe. You’re just lowering the pressure in the pipe, and atmospheric pressure pushes the water upwards to fill the low pressure. After 32 feet tall, the top of the hose/pipe will be a perfect vacuum, atmospheric pressure won’t be able to push liquid water upwards any farther, and the water will just begin cold-boiling in the top of the pipe as the liquid water turns into gas (steam) to fill the vacuum.

But tall trees can move water all the way to their leaves by using only passive capillary action, and suction created by water evaporating out of their leaves. The capillary action is created by tiny straw-like fibers that run all the way up the tree and are bunched together really tightly. Due to surface tension, water is able to “climb” the capillaries as the surface tension fills as much surface area as possible. Then at the top of the tree, as the water evaporates out of the leaves, it draws up fresh water to fill the void.

But that means the bottom of the tree should need to support the pressure of all of the water above it. But it doesn’t, because the surface tension holds the water stable inside of the trunk.

By this logic, does this mean my striped cat doesn't realize she has stripes?

Wait, what?!?

Is it all humans or just those humans with two X chromosomes? Relevant video on the subject: https://www.youtube.com/watch?v=BD6h-wDj7bw

Also in this video, we can see female cat's stripes in their fur color.

Shouldn't that be 2? Mars and Venus.

I love your username, btw. No single character on TV has ever given me greater joy from facial expression alone, than her

Care to expand on that one? I know he's ex military but haven't heard anything like that before.

The electric field one is also interesting, because the cable length doesn’t actually determine how long it takes to turn on. All that matters is the distance between the power source and the device. Electricity travels at the speed of light, which means we can measure how long it should take to travel down the wire.

But let’s say you have a 1 light year long power cable, made out of a perfect conductor (so we don’t need to worry about power loss from things like wire resistance or heat). Then you set the power source right next to the device and turn it on. The logical person may say that the device would take a full year to turn on, because the cable is one light year long. Others may say that it will take two light years to turn on; Long enough for the electricity to make a full circuit down the cable and back to the power source again.

But instead, the device turns on (nearly) instantly. Because the wire isn’t actually what causes the device to turn on. The device turns on because of an EM field between itself and the power source. The wire is simply facilitating the creation of that field. The only thing that matters is the distance between the source of power and the device. That distance, divided by the speed of light, is how long the device will take to turn on. If the device was a full light year away from the power source, it would take a full year to turn on. But since the device is sitting right next to the power source, it turns on right away.

I had to looks this one up, but missed the "galaxy" vs "universe". There are an estimated 3 trillion trees, 100-400 billion stars in the milky way galaxy, but potentially 1 septilliom stars in the universe.

However all three of these are estimates, so who actually knows.

omg la is east of reno what is happening rn

If you head south from Detroit the first foreign country you’ll hit is Canada.

There's also Angle Inlet, Minnesota which is the only place in the contiguous United States north of the 49th parallel. To travel to Angle Inlet by road from other parts of Minnesota, or from anywhere in the United States, requires driving through Manitoba, Canada. It's a really weird border.

"Wow you signed the document in blood, you must be really hardcore."

"No I'm just cheap."

This link is about the moon but it starts by covering how to view space and orbital objects including simulators which allow one to do what you describe, as well as the ability to move the camera from on ball to the other and many other interesting simulations. https://ciechanow.ski/moon/

Yeah, this one took me a while to wrap my head around and intuitively “get it”. I first learned it was true from that mythbusters episode where they correct their past mistakes… and even they had thought that two cars hitting head on would receive the same energy as hitting a stationary wall at the speed of the sum of their speeds. They were corrected in letters written to them, and then they experimentally verified it.

And even seeing the experimental verification, it still took me a while to really get it. The opposite speeds cancel out, making you go from your speed to zero. Same as if you hit a brick wall at that speed.

Let’s say the two cars are going 50 mph (kph, whatever unit you want). 50-50=0. You experience the same as hitting the brick wall. It’s the difference between initial speed and final speed that matters, not the sum of their speeds.

So far!

the point was to post unbeliavable facts

This is an eminently believable fact.

yes, but those same oligarchs were the one's funding the entire war effort at the time time, and - ohwaitnvm...

Samuel L Jackson was in Grease. The movie.

Not the Boo Box!

Doesn't it have a much bigger population than Aus? Wikipedia says that California has about 39 million people and Australia only 27 million.

Did you also know that one of the first motion pictures was shot to measure the gate of a race horse by Leland Stanford, who would go on to create Stanford University where the eugenics movement would get its legs and horse breeding theories of genetic prowess were applied to humans, and subsequently they would use the Stanford University as a test bed to breed umbermensch that would go on to inspire the Nazis? Yes this sounds insane but all of it is true. Also college football became a method to study human combat ability for the US military.

Also an unbelievable fact, you responded to user Potoooooooo about Potoooooooo the horse.

I really love this story about the horse.

While I think your point is true that its much more abstract than people realize. When I worked at a bank and we disbursed loans and credited/debited fees it was from "GLs" (General Ledger?) which were basically just separate accounts to help keep track. Like we had a "member service" one which was for basically anything with good reason. One time someone did a very large amount but he just basically got told to do it a different way.

Its all just in a computer. I could've accidentally credited someone a million dollars but it would've been realized when I tried to close my drawer and balance everything out. And the branch would have to be balanced at the end of the day so I assume the bank did as well.

On a related note banks take out loans from other banks. I think a lot of people don't realize that banks have savings accounts so they have money to lend.

Gulp..."was"?

Just once it would be nice to see him on the receiving end

That's...pretty believable.