Every eye has a tiny blind spot near the middle. But your brain makes it disappear and you don’t realize it’s there.
You can verify this. Draw a dot on a bit of paper. Close one eye, stare at a fixed point, now move the paper around the center until the dot disappears…magic
What we consider reality, is a synthesis our brain is presenting to us, it is an approximation… realizing that is a real mind blower
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.
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.
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.
Another fun fact: through that hole there’s also vasculature and capillaries coming through and you can actually see them by looking at a well lit white surface and creating a tiny pinhole with your hand right in front of your eye and wiggling it. Better explained here at around 5:30
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.
This isn’t due to the blind spot, but it is still pretty weird to experience! Here’s some more info if you are curious: https://en.m.wikipedia.org/wiki/Averted_vision
by weight, theres more non-human DNA in you than human.
Wait. Please explain. How is DNA inside me, a verifiable human, not human?
The average person does not have 10 fingers. Maybe the median person, but not the average.
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 10 to not be the median it would also have to not be the case for the majority of people (just the plurality at best), and while I don’t have proof handy I’m pretty sure a vast majority have exactly 10, making that the precise median and the mode. Only the mean would be a different number of digits. (Both definitions)
Mode assumes categorical data and is unbounded by range, whereas median makes the most sense for decimal numbers, albeit with rounding in this case
“People have round(median(data))
fingers”
edit: though, if we’re counting just fingers and not counting half-fingers, then maybe this really is categorical data (¯\(ツ)/¯?)
Glenn Close was in Hook
Lots of people know a broken clock is right twice per day, but many are unaware that a clock running backwards is right 4 times per day.
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?