25 Kickass and Interesting Facts About Humans – Part 2

Here is part 2 of 25 Kickass and Interesting Facts About Humans. For part 1, click here.

1-5 Interesting Facts About Humans

1. Humans are unlikely to sink entirely into quicksand due to the higher density of the fluid. Quicksand has a density of about 2 grams per milliliter, while human density is only about 1 gram per milliliter. A human would descend about up to their waist, but no further. – Source

2. Some humans can be tetrachromats, which gives them the ability to see more colors than a normal human, like Concetta Antico, an Australian artist who can see 100 times more colors than a regular human. – Source

3. In the last 5 millennia, genetic change in humans has occurred at a rate roughly 100 times higher than any other period of human evolution. Humans today are more genetically different from humans living 5,000 years ago than these people were from humans living 40,000 years ago. – Source

4. Cockroaches are so repulsed by humans that if they’re touched by a human, not only do they run away, but they wash themselves. – Source

5. Human life expectancy has increased more in the last 50 years than in the previous 200,000 years of human existence. – Source

6-10 Interesting Facts About Humans

6. Children born blind still smile, meaning smiling is not a learned response. It’s something humans do innately. – Source

7. Humans and dogs are the only two species known to seek visual cues from another individual’s eyes, and dogs only do this when interacting with humans. – Source

8. The liver is the only human internal organ able to regenerate itself; as little as 25% can regenerate back into a whole liver.- Source

9. Babies learn a language by hearing it, but they must hear it spoken directly to them in person by another human being; as little as 12 hours with a human tutor produces dramatic results in babies, compared to no results even after many more hours of exposure to foreign language TV shows. – Source

10. Humans usually get the urge to pee when the bladder is just 1/3 full. But in zero gravity, the urge doesn’t kick in till the bladder is almost completely full. When John Glenn orbited the Earth, his only urination was 27 ounces, seven ounces more than the capacity of the average human bladder. – Source

11-15 Interesting Facts About Humans

11. In athletics, if you move as the gun sounds, it is considered a false started as the human brain cannot hear and process the noise of the starting gun in under 0.10 seconds. – Source

12. Humans have the ability to see ultraviolet (UV) light, but it is filtered by the eye’s lens. People who have surgery to remove the lens (typically because of cataracts) can see UV light. – Source

13. A gorilla’s erection is just over one inch long. Humans are the most endowed of all primates. – Source

14. Corn can only exist if cultivated by humans, and there is evidence to support humans figured this out over 7,000 years ago. – Source

15. Archaeologists have found the remains of what appears to be a family group of 12 Neanderthals in Spain who were killed, butchered, and cannibalized by other humans about 42,000 years ago. – Source

16-20 Interesting Facts About Humans

16. It is suggested that staring at fire improved brain functions such as memory and problem solving in early humans. – Source

17. Only two species have domesticated other species: humans and ants. – Source

18. Supposedly haunted locations share a similar low-frequency sound that can cause fear and panic in humans. – Source

19. The human ear can’t tell where low frequencies come from. That’s why subwoofers can be hidden in home theaters or in trunks of cars. – Source

20. Before agriculture, human jaws were a perfect fit for human teeth. – Source

21-25 Interesting Facts About Humans

21. There is evidence that once infected with flu, the virus influences humans to be more social and come into contact with large groups of people. – Source

22. The Plantaris is a small muscle in your calf that is believed to be used by our ancestors to grip with their feet. It is so weak that it is considered functionally obsolete and arguments have been made that humans are evolving it out. It is absent in 7-10% of the population worldwide. – Source

23. Researchers have identified a naturally occurring bacteria in the human gut that keeps people from developing food allergies. This beneficial gut bacterium is diminished with frequent antibiotic use at a young age, making children more susceptible to food allergies later in life. – Source

24. In 5,000 years of human history, only 2 diseases have been eradicated: smallpox and rinderpest – Source

25. The genome of modern humans contains the DNA from four different hominid ancestors: homo sapiens, Neanderthals, Denisovans, and a fourth species that has yet to be discovered. – Source