Even if you’re a full-grown adult with a degree, job experience, or a family under your belt, you don’t know everything there is to know about this world. As we get older, we should realize how little each of us knows (and how small we truly are in the world).

Did you know…

1. This is how people collect lava?

This is how people collect lava?

YouTube / USGS

Fun fact: If you fall in a pool of lava, you will not sink into it. The density of lava is three times greater than a human body and between a hundred thousand to a million times more viscous than water.

2. This is how refraction works?

This is how refraction works?

YouTube / Home Science

3. This is how puffer fish deflate?

This is how puffer fish deflate?

YouTube / True Valley

Fun Fact: Dolphins like to get high off of puffer fish toxin.

4. How dolls get their eyes?

How dolls get their eyes?

Imgur / John Rowley

5. How camouflage helmets are painted?

How camouflage helmets are painted?

Sploid

Fun fact: It is illegal for anyone, even children, to wear camouflage clothing of any kind in Barbados.

6. How pelicans eat?

How pelicans eat?

App.siz.io

7. What happens in your toilet when you flush?

What happens in your toilet when you flush?

Flow-3D

Fun fact: It wasn’t until the 1930s that production techniques improved to the point where toilet paper could be advertised as “splinter-free.”

8. How a VCR really worked?

How a VCR really worked?

YouTube / Sadministrator

9. Exactly how the Pythagorean theorem works?

Exactly how the Pythagorean theorem works?

Stack Exchange

Fun fact: The Scarecrow from The Wizard of Oz got the Pythagorean theorem wrong after the Wizard gave him his diploma.

10. That cameras can auto-stabilize like this?

That cameras can auto-stabilize like this?

FSTO Plounge

11. What happens inside a mother’s body during a pregnancy?

What happens inside a mother's body during a pregnancy?

MSI Chicago

Fun fact: MTV’s 16 and Pregnant has been linked to a decrease in teen pregnancies.

12. What movies look like before adding CGI?

What movies look like before adding CGI?

YouTube / PIXOMONDO

13. What the world looks like to someone who is color-blind?

What the world looks like to someone who is color-blind?

IFL Science

Fun fact: After making 1.4 billion crayons, the senior crayon maker for Crayola admitted he was color-blind.

14. How waffle fries are really made?

How waffle fries are really made?

YouTube / DR453

15. What swallowing looks like on the inside?

What swallowing looks like on the inside?

YouTube / Spladgum

Fun fact: NASA cannot bring birds into space because they need gravity to swallow.

16. How big the sun really is?

17. What NFL players feel on EVERY SINGLE HIT?

18. What oysters really do for our oceans?

19. What a self-driving intersection would look like?

What a self-driving intersection would look like?

YouTube / csatc2002

Fun fact: Google’s self-driving cars have an “Aggressive” mode.

(via BuzzFeed)

…Yep, the world really is an interesting place (and I know nothing about it).