Square Earth; Perpetual Motion
The shape of the Earth can be determined solely from biblical passages:
Why the Earth must be square
We know that God is perfect. God would, therefore, have created the Earth in the most perfect shape possible. As I've already proven, we know from Rev 7:1, Isaiah 11:12, and Job that the Earth must be a rhombus of some sort. It makes good Biblical sense that God would have created Earth to be the most perfect kind of rhombus possible. The most perfect kind of rhombus is the square. Its rectilinear corners perfectly match the rectitude of God. Therefore, the Earth must be square.
Perpetual Motion Pioneers (The Movers and Shakers.)
Well-illustrated page on the origins of basic perpetual motion ideas. Leonardo Da Vinci was one of the earliest debunkers:
Leonardo's famous comment comparing perpetual motion seekers to alchemists is often quoted. "Oh, ye seekers after perpetual motion, how many vain chimeras have you pursued? Go and take your place with the alchemists." The last reference is to "seekers after gold", which at least one translator has misinterpreted as "gold-diggers".There are doodles in his notebooks of such devices, but
We often can't determine whether a particular device included in his notebooks was of his own design, or of someone else, and we can't always know whether Leonardo considered it workable or practical.
A google image search returns many results for leonardo perpetual motion or davinci perpetual motion. Mostly scans of the scripts, and some photographs of "working" models.