Here is a concise summary of the content:
**Title:** 7 Things You Were Better Off Not Knowing
**Summary:**
A countdown of 7 unsettling facts, including:
1. **Teratoma Tumors**: Can grow hair, teeth, eyes, and limbs, showcasing a disturbing failure of nature.
2. **Decapitation**: A human head can remain alive for a brief moment after decapitation, confirmed through animal tests.
3. **Dolphin Behavior**: Dolphins, known for intelligence and pleasure-driven sex, have been reported to engage in behavior perceived as rape (note: not in the human sense).
4. **Farting in Enclosed Spaces**: The average person passes gas at least once a day, making enclosed spaces like subways and offices prone to airborne particles.
5. **Subway Air Quality**: Riders breathe in approximately 15-20% human skin particles during rush hour.
6. **Cheap Sausage Production**: Some countries with scarce health controls produce sausages by grinding entire animals, leading to potentially contaminated products.
7. **Office Hygiene**: 20-40% of office glasses may contain fecal matter due to inadequate handwashing after using the bathroom.
Here are the extracted key facts, each numbered and in short sentences, excluding opinions:
**Human Body and Hygiene**
1. The human body generates 20 liters of sweat per year, approximately.
2. Fecal matter can pass through up to 10 layers of a normal sheet of toilet paper.
3. Particles of excrement can remain on fingers or nails after using toilet paper.
4. Humans lose and regenerate a significant amount of skin per year.
5. People breathe in approximately 15-20% of human skin particles in closed spaces like subways.
**Food and Consumption**
6. Cheap sausages in some countries are made by directly grinding animals without thorough hygiene controls.
7. A study found that 20% to 40% of office glasses may contain fecal matter.
**Animals and Environment**
8. Dolphins are known to have sex for pleasure, according to studies.
9. There are at least 15 annual reports in the US of people claiming dolphins have attempted to assault them.
**Medical and Scientific Facts**
10. Teratoma tumors can develop muscle, bone tissue, hair, teeth, small arms, and even eyes.
11. Teratoma tumors are mostly found in ovaries in women and testicles in men and can be benign or malignant.
12. Surgery is necessary to remove teratoma tumors.
**Miscellaneous**
13. Humans, on average, pass gas at least once a day.
14. A human head can remain alive for a brief instant after a clean and quick decapitation, as verified by animal tests.