Kubanator said:
The Greeks knew the Earth was round, and actually knew the circumference of it. They would put a ship on the horizon, and then knowing the height of the ship, and the angle between the top of the ship and the bottom, would measure the distance. Then using magical trigonometry, they found out the circumference of the Earth
As smart as the Greek methods of calculating the Earth's circumference were, they still missed. Yes, I love nitpicking... Well, I kid.
Also, the Mesopotamians had batteries.
Well, I wouldn't say that. They had something which could work like a low-power battery, most probably not even enough to power anything useful, not even to give you a proper shock... And we don't know if they recognized their significance or just considered them an amusing novelty ("A great ice-breaker at parties!").
Then again, a lot of the popular perception about how science only started in the Enlightenment is a myth made up by the Enlightenment thinkers themselves, who on their own didn't really contribute much... There was a lot of proper science going on for centuries (AT THE VERY LEAST since William of Ockham, but some centuries before him there was Avicenna... You could find a long string of them), if not millennia, before them.