Whitelist Recruitment but..

Did you know that an "immortal jellyfish" exists? That strange creature will use a rare cellular mechanism called "transdifferentiation" to respawn as a new polyp clone colony :)

most people have their face covered in small mites
really freaky

The most potent smelling substance (or worst smelling in other words) is Thioacetone. There's not much info about it because it doesn't have any use so far and it's so awful to work with that no one rushes to experiment with it. You'll be able to smell a drop of it instantly, even at a few hundred meters away. It induces nausea and vomiting and it has been described as "fearful".
Taken straight from the wikipedia page:

"In 1889, an attempt to distill the chemical in the German city of Freiburg was followed by cases of vomiting, nausea and unconsciousness in an area with a radius of 0.75 kilometers around the laboratory due to the smell."
"In 1967, Esso researchers repeated the experiment of cracking trithioacetone, at a laboratory south of Oxford, UK. They reported their experience as follows:
Recently we found ourselves with an odour problem beyond our worst expectations. During early experiments, a stopper jumped from a bottle of residues, and, although replaced at once, resulted in an immediate complaint of nausea and sickness from colleagues working in a building two hundred yards [180 m] away. Two of our chemists who had done no more than investigate the cracking of minute amounts of trithioacetone found themselves the object of hostile stares in a restaurant and suffered the humiliation of having a waitress spray the area around them with a deodorant. The odours defied the expected effects of dilution since workers in the laboratory did not find the odours intolerable ... and genuinely denied responsibility since they were working in closed systems. To convince them otherwise, they were dispersed with other observers around the laboratory, at distances up to a quarter of a mile [0.40 km], and one drop of either acetone gem-dithiol or the mother liquors from crude trithioacetone crystallisations were placed on a watch glass in a fume cupboard. The odour was detected downwind in seconds"

There is a "sound channel" about 1,000 meters deep in the ocean where sounds will carry much farther than any other depth. It is often used for long-distance communication!
https://oceanservice.noaa.gov/facts/sofar.html

hot water freezes faster than cold water

Sound cannot go louder than 194 db (on Earth, with normal air conditions), as past that limit air cannot move anymore. A blast of sound at this theoretical volume would wreck unprecedented havoc the likes of which is really hard to imagine.

For comparison, the loudest sound ever recorded was a volcano eruption in 1883. It produced an insanely loud bang, mesured at 174db approximately 160km from the site.The sound was so loud that it produced four times more power than the Tsar Bomba. People living nearly 5000km from the site heard it as if it was a nearby cannon. People got ear injuries hundreds of miles away.

If like me you think this is fascinating, this video is where I learnt about this and it was, indeed, a fascinating watch.

A cockroach can live for up to one week without its head.

The center of our galaxy smells like raspberries and rum

Every cell in your body has been dividing since life began on earth. And they will continue to share, being passed on to our descendants. This chain of cell division will be interrupted only with the death of your last descendant.

If humidity gets too high, relatively low heat can kill humans. The equivalent of 95°F/35°C at 100% relative humidity can kill even healthy humans. This is called a Wet Bulb Event. It happens since Humans rely on evaporating sweat to stay cool. Makes me wonder the temps here go all the way up to 40 with humidity around 70% should I be worried?

Hummingbirds are the only species of birds that can fly backwards for any period of time.

Hot water and cold water make a different sound when poured.

This isn't so obscure, but it is so surprising (and so hard to believe!) that it deserves mention: The Banach-Tarski "paradox".

It says that it is possible to separate a solid ball in exactly five disjoint pieces, and then recombine the pieces (just by moving the pieces, without changing their shape at all) to form exactly two solid balls of the same size as the original one.

Here is the Wikipedia article on it, and a nice Vsauce video actually gives the proof.

By the way, it is not really a paradox, it is just very very very very counter intuitive. Bottom line, there are no laws of Nature or Math that forbid this operation (well, ok, the Axiom of Choice is used in the proof)... It is just that the pieces have no definable "volume".

there's a star in the universe that is by the scientists' measurement of the age of the star and the universe is older than the universe itself, the universe's age has been known to be 13.8 B years old while the star (Methuselah or HD 140283) is weirdly 14.46 B years old .sooo ..yeah I don't know what that's about(exk) .,

Due to the way their feet bones work, elephants are always walking on the tips of their toes.

More than 82% of the Earth's volume is contained in the earth's mantle, a nearly 2900-kilometer-thick shell extending from the base of the crust to the liquid outer core.

When you cremate someone there is a moment at which the meat is perfectly cooked.

Some theorize that the orange colors predominant in the sky in Edvard Munch's The Scream are the result of increased Mie Scatter, a result of the large concentration of aerosols resulting from the eruption of Krakatoa Volcano. This volcano erupted on August 23, 1883 (I think it actually exploded) and The Scream was painted in the year 1893. Aerosols, a result of the volcanic eruption, are suspended in the sky for many years after the eruption.

Sharks are older than trees.

Yep, not kidding. Feel free to fact-check me on that. ;)

Water can boil and freeze at the same time.

You can't kill yourself by holding your breath.

pineapples, oranges, and tomatoes are actually berries

The sea squirt eats its own brain!

Rain doesn’t always make the ground wet.

In dry, hot places, rain sometimes evaporates before it hits the ground. Environmentalist Edward Abbey describes “phantom rain” this way: “You see curtains of rain dangling in the sky while the living things wither below for want of water. Torture by tantalizing, hope without fulfillment. Then the clouds dissipate into nothingness.”

Rain of animals is an actual thing, currently with no proven explanation.
I am waiting for a rain of mango, that would be awesome 😋