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What makes human development much faster/different (IMO) is that we can store and pass on information to the next generations.

And as soon as the crows understand the way to do it, their development will accelerate drastically too.

Try pissing off a crow sometime. If you irritate it enough, it will tell its friends how to recognize you.

You'll know when this happens.

The radio announced today that if one is especially nice to crows, certain ones will bring you gifts such as shiny bits of glass and trinkets

Yes, that with "hands."