Weirdest/things that blew your mind when you learned them

[mattt]

I think "the experience of color" is best understood as certain states of parts of the nervous system. I think this way because my dreams are full of colors, even though no photons (of the visible band) hit my retinas at those moments.

Of course you can trigger those states of your nervous system by means of different mechanisms: exciting the cones and rods in your retina, dreaming or just imagining colors with your eyes shut.

 

[melissaa]

Green's theorem is the weirdest most mind¤#%& theorem I have learned about (yet). It doesn't matter how one picks $M$ or $L$, as long as they satisfy certain conditions the result holds. I don't even have the vocabulary to explain why it's so strange.

Same here!

 

[MikeeMiracle]

For me it's the Delayed Choice Quantum Eraser experiment, think about it every night before I sleep.

 

[Frigus]

Bacteriophages,
More appropriately they don't blew my mind but they give me goosebumps,
the thing which really amazes me is to think about the ongoing wars in our body and even on head and in normal life we don't even have any clue about these wars!
To me they seems like some secret agency that is constantly protecting Earth from aliens.