my wiew on the 8 wonders of the world - the greatest inventions!

[xorxor]

wheel

currency

irrigation

steam

electricity

internal combustion

internet

bitcoin


What do you think? 

I think maybe urbanisation is more important than steam, but it is not a single invention/development. it is combination of sewers/water network/highly efficient farming/all new technologies.

this 8 points are just my first thought, maybe you can perfect it with some sugestions

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[porcupine87]

I would not include Bitcoin. It is pretty cool but pretty small, too.

For me:
fire

wheel

steam

car (motorized vehicles)

electrictiy

cooling systems (refrigerator)

internet

PORN

[knight22]

Porn is an invention 

[domob]

When thinking about these things, I always add calculus (in particular derivatives and integrals) to my list.  After all, this is the very foundation on which most of modern engineering and science is built!

[cschoeny]

Guttenberg's printing press definitely needs to be on this list.

[xorxor]

When thinking about these things, I always add calculus (in particular derivatives and integrals) to my list.  After all, this is the very foundation on which most of modern engineering and science is built!

Yup. I was thinking that extremally important, but it evolved not discovered. even monkeys and birds can count to limited numbers.

Guttenberg's printing press definitely needs to be on this list.

oh, a big one. also somebody sugesting  "personal computer".
both a big thing, but what to remove ?