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A Crap 'Chute
A Crap 'Chute

"They still haven't done a proper randomized double-blind trial on whether parachute use prevents death when jumping out of airplanes."

(Source)

Pivot!
Pivot!

"The maximum area of a curved couch that can fit around a corner in a hallway; it is a real unproven mathematical problem. It's called the moving sofa problem."

(Source)

Failed Test
Failed Test

"Myers-Briggs tests are not really based on anything. People seem to put lots of stock in them, nonetheless."

(Source)

Detox Detox
Detox Detox

"Any of those detoxes/cleanses. Gtfo that's what your liver is for."

(Source)

Magic Pill
Magic Pill

"I'm in pharmacy school and it's surprising how many medications that are out there that we're still not 100% sure why or how it works. The most surprising that I've come across is Tylenol. We know what it's used for and have theories as to how it works, but from a mechanistic point of view we're not entirely positive."

(Source)

Core Questions
Core Questions

"What exactly the Earth's core is made of and how it works. We know the inner core is solid and the outer core is liquid and we're pretty confident they're both primarily composed of iron and nickel plus some other elements. We don't fully understand how the outer core produces the Earth's magnetic field and we have no idea why the magnetic field periodically weakens and flips. It's kind of surprising when you realize we have a better understanding of what goes on inside the Sun than the Earth."

(Source)

Something's Fishy
Something's Fishy

"That fish don't feel pain. It's currently a massive debate, as there's evidence to support both sides of the argument."

(Source)

Why We Sleep
Why We Sleep

"Why we have the need to sleep. There is no real scientific explanation for this, our body doesn't shut down or turn off when we sleep, everything keeps running but yet we can die if we don't get enough sleep."

(Source)

Sugar High
Sugar High

"There is no evidence that sugar causes hyperactivity -- in fact, there is evidence that it does not."

(Source)

Morning Munchies
Morning Munchies

"'Breakfast is the most important meal of the day.' Most of the studies that support some sort of significant early morning meal are based purely on school age children and tied to attention span or academic achievement. There have been very few if any studies comparing large vs small breakfast vs Intermittent Fasting (IF) vs just eat when you're hungry protocols and none focus on weight loss vs athletic performance or just general health. There's also been almost nothing on what defines "part of this complete breakfast" as you see in the cereal commercials. Nothing reputable done on high protein (bacon and eggs) vs high carb (cereal and toast). It's interesting to me that a saying so taken as fact has so little scientific evidence or protocol."

(Source)

Monkey Business
Monkey Business

"Whether or not humans can mate with other primates."

(Source)

The Moon Problem
The Moon Problem

"We don't know why or how earth has such a large moon. The best theory apparently has major flaws still last time I was reading about it."

(Source)

Going Under
Going Under

"We don't know how surgical anesthetics work - all we know is that when we wake up, we don't remember the pain. The effects on the brain are yet to be known. It is wholly possible that we feel each and every excruciating moment of pain during the surgery, but, like alcohol does, our ability to form memories is impaired for those few hours. Scary."

(Source)

In Sync
In Sync

"The McClintock Effect, of women living together syncing their menstrual cycles. Surprisingly there is no credible scientific evidence of this, aside from the now discredited original study back in the '70s. According to science, women do not sync up, despite common thought. As far as we know, it's a purely psychological and perception effect, rather than a biological one. A menstrual cycle really isn't that long, and the chances of syncing up for a while is really quite high."

(Source)

Salty
Salty

"Cutting salt intake from diet may have zero correlation to heart attack and stroke incidence."

(Source)

The Final Frontier
The Final Frontier

"Astronomer here! Many of you have likely heard about pulsars, which are neutron stars the size of a city that rotate as fast as thousands of times a second (and, at slowest, a few seconds per spin). We know this because pulsars emit a beam of radiation in the radio spectrum, which we can see each time the pulsar spins (like a lighthouse beam). We also can predict these beams so precisely they are more accurate than atomic clocks for timekeeping, and were used for the first indirect proof of gravitational waves.

So it sounds like we know a lot about pulsars, right? Well get this- no one has a clue what creates the emitted beam in the first place. We have known about these things since the 60s, and can do all these amazing experiments using them for timing, but what actually causes the emission? No friggin' clue. Neutron stars are just made of very exotic, very dense fundamental particles in ways that are impossible to recreate on Earth (a teaspoonful of the stuff would weigh about 10 million tons on Earth), so while there's been a lot of theoretical work on this problem no one knows as yet what causes the radio emission after half a century plus of research."

(Source)

Pi Problem
Pi Problem

"That pi contains every possible finite sequence of digits. It might be true, it might not be. It's not proven either way."

(Source)

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