Bracchia Quotes (1 quote)
If a man has a tent made of linen of which the apertures have all been stopped up, and be it twelve bracchia across (over twenty-five feet) and twelve in depth, he will be able to throw himself down from any height without sustaining injury. [His concept of the parachute.]
In Isaac Asimov and Jason A. Shulman, Isaac Asimov’s Book of Science and Nature Quotations (1988), 3-4, which notes twelve bracchia is over 25 feet. There are other translations with different units. Da Vinci’s illustration in his notebook showed a pyramid-shaped parachute below which hung a man suspended by a few short cords.

In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) --
Carl Sagan
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