It's possible – not common, but possible – to grow teeth in your ovaries.
Some people lactate through the skin of their armpit after giving birth.
"Ectopic axillary breast tissue" is where breasts stretch out beyond their usual boundaries, often expanding sideways into the armpit. Pregnancy doesn't cause this, but lactation can make it show up – some people find that milk travels to their 'pits when they're breastfeeding, and others even end up lactating from the pores underneath their arms.
Period cramps are essentially your womb suffocating itself, and honestly? I'm disgusted, but not surprised.
To get the uterine lining out of your womb during your period, your uterus has to contract. Sometimes, when the contractions are stronger, your womb squeezes its blood vessels so tight that oxygen can't reach them, which sends pain signals to your brain (ouch). But wait, there's more – this process increases your production of chemicals called prostaglandins, which encourage more contractions of the uterus. There really is no mercy.
Because your brain has no pain receptors, brain surgery is sometimes performed while the patient is awake (and often even talking).
It sounds like something from a horror film, but keeping the patient awake and responsive during brain surgery can actually be a much safer way to operate because the surgeons can ensure they're not causing any significant damage. Still, it's a pretty scary thought.
When you feel your heart in your mouth on a rollercoaster, it's not just your imagination – your organs actually are moving around.
There is probably more bacteria in your mouth right now than there are people in your country.
Unless you live in China or India, it's unlikely the population of your home country outnumbers the billion or so bacteria that are hanging out in your mouth at any given time.
In fact, you yourself are more bacteria than you are human – at least if we're talking about cells here.
The bacterial cells in your body outnumber your human cells significantly. In fact, scientists once thought that ratio was about 10 to one in favour of bacteria, but more recent research has found that's it's likely to "only" be 39 trillion bacteria compared to 30 trillion human cells. Better, but not exactly reassuring, folks.
You produce enough saliva in your lifetime to fill two swimming pools.
When your cheeks blush, so does the lining of your stomach.
A large percentage of the dust around your home is made up of old skin flakes, and when you consider that you lose about 50 million cells a day, that's not all that surprising.
Hate to have to tell you this, but there are probably mites living in your eyelashes right now.
Two types of Demodex mites – Demodex folliculorum and Demodex brevis – populate your lashes. They live off of the dead skin cells in the tiny hairs and while normal levels of the crittters are harmless, they're still, you know, there.
You transfer more germs by shaking hands than you do by kissing, because yes, hands are that gross.
The anus is the first part of your body to develop in the womb.
The fitter you are, the sooner you might start sweating during exercise, so don't feel bad if you're drenched after a workout.
Stress can make you produce more earwax than usual, and worry-induced wax smells worse than the stress-free kind.
The apocrine glands in your ear are the same glands that are responsible for your smelliest sweat, and when you'e stressed or sick, they can encourage faster, smellier earwax production. It's basically the same process that makes you sweat when you're worried, only somehow this is even less appealing.
Ever heard the phrase "brain worms"? Yeah, turns out actual brain worms really do exist (don't mind me, just exiting the planet).
The average person breaks wind about fourteen times a day. Fourteen. Times.
Your nose and throat are always coated with a layer of mucus...
...so it kind of makes sense that most of us swallow about 1.5 pints of the slimy stuff every day.