Who invented the first crude hygrometer?

Leonardo da Vince was a Genius.

All i thought of Leonardo da Vince is a good painter dont he's also scientist and more

Myffa, If you read what I said, he did drawings. I made no comment on whether they would work or not

Myffa, He was still a genius!

Coo, The drawings were frequently of things that could never actually work, like the helicopter and sub. They were fantasies. And he never finished everyhing.

Marcy, The man couldn't help himself. He also did drawings of a type of helicopter and a submarine. I don't believe it, but there are those who think he was a time traveller.

Cannot write enough about this genius.