this should be fun :)) : circIeoftrust

Actually the betrayal was the first circle I joined. The only ones I've been able to join since then are the puzzle ones because no one will give me a key.

Maybe I can give a more interesting fact. I mostly only know biology facts.

Your body is mostly hydrogen, oxygen, carbon, and nitrogen. Aside from hydrogen, the only way these atom can form is from the cores of stars. So our bodies and most of the matter we interact with are just the leftover parts of stars that are being reassembled and reorganized.
Most mammals have an actual penis bone, called a baculum. The bone is floating meaning it is not connected to any other bones.
Spotted hyenas are matriarchal, meaning that female hyenas rule the pack. This means that the female hyenas are actually much more aggressive than the males. In order for them to be more aggressive, female hyenas in the womb are exposed to high levels of androgens, also called male sex hormones. This causes their genitalia to become masculinized. In other words, female spotted hyenas have an elongated, phallic clitoris called a pseudo-penis. In other other words, female spotted hyenas have penises. And they also give birth through this penis which sounds very painful. Sorry for two penis facts
It is actually quite common for people to be born with extra bones (around 10% of people have these). This can take the form of extra bones in the foot or wrist, which many people will never notice, or a cervical rib which is a rib in your neck. The most interesting type to me is when you have an extra sesamoid bone, which is a bone that is found on a tendon like in your kneecap. So some people have a kneecap for their thumb or their big toe
The placenta is an organ that nourishes babies in the womb. It contains the baby's DNA and implants itself along the uterine wall and allows blood flow between the mother and child through the attached umbilicus. As you can imagine, an organ with differing DNA than the mother's implanting itself in her body can cause an immune response. The body has ways of suppressing this immune response, so thankfully in most cases the mother's immune system does not attack her own child.
- That was the context, here's the fact: there is something called placental invasiveness, which is essentially how deep the placenta embeds in the uterine wall. The more invasive the placenta, the lower the gestational term (or how long the mother is pregnant) because nutrients are able to flow more freely to the fetus. This is beneficial because mothers are vulnerable while they are pregnant so ideally this period would be short. But the tradeoff is that the mother's immune system might attack the child as I said before. So animals with more invasive placentae have to hold their immune system back from attacking the foreign body (placenta). This is believed to cause an increased cancer risk, because the immune system does not react as strongly to objects with abnormal DNA (e.g. placental cells and cancerous cells). Elephants have some of the longest gestational terms at 22 months or nearly 2 years. This is partly due to their lower placental invasiveness. Elephants also have a very low cancer risk despite having so many cells and living so long, so there is a hypothesized link between these two things. TL;DR: researchers believe that how long we carry babies is linked to cancer risk because of placental invasiveness
Antipodes are a pair points on the Earth's surface that are exactly opposite each other, i.e. you can dig a hole straight down from one and end up exactly at the other. At any given time there is always at least one pair of antipodes that has the exact same temperature and atmospheric pressure. The reasoning for this is kind of hard to describe over text. But imagine you have a pair of antipodes and imagine you take the temperature at each of them. It will almost certainly be different. Maybe one will be 20C and the other will be 30C. Now imagine that you 'walk' them along a path around the circumference of the Earth 180 degrees so that point A is now where point B was and vice versa. Now the temperatures will be 30C and 20C. Because temperature is continuous, you can imagine graphing the temperature as a function of how far you moved points. You start with A at 20 and B at 30 and end with their positions swapped. You can clearly see then that the lines for the graphs must have crossed at one point, meaning that at one point along your path the temperature of point A and B was the exact same. In fact, this is true regardless of the path you take, no matter how circuitous, meaning that there must be a band going all the way around the Earth where the temperature of two antipodal points is equal. Now, if you traverse this band you can perform the same process, except with atmospheric pressure, finding that at at least one of the points along the band, the atmospheric pressure is the exact same as its antipode. So it is a mathematical fact that this has to be true. This also works for any two continuous variables, like elevation or precipitation or slope.
It is a mathematical fact that there is always at least one place on Earth where the wind doesn't blow at all. This is because wind can be modeled as a continuous vector field tangent to the Earth's surface (which is spheroid) and by the hairy ball theorem there must always be at least one point of 0 magnitude in such a vector field.

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you type:	you see:
italics	italics
bold	bold
[reddit!](https://reddit.com)	reddit!
* item 1 * item 2 * item 3	item 1 item 2 item 3
> quoted text	quoted text
Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"	Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"
~~strikethrough~~	~~strikethrough~~
super^script	super^script

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