Why birds can fly: Brought to you by classical logic

By Gordon Rugg

You might already be familiar with the Monty Python scene where one of King Arthur’s knights uses logical reasoning to show why witches and ducks float. As with much of Monty Python, it’s fairly close to something that actually happened.

Here’s Vitruvius, the famous Roman engineer and architect, using the four elements theory (that all things are made of various mixtures of air, fire, water and earth) to explain why birds are able to fly.

Winged creatures have less of the earthy, less moisture, heat in moderation, air in large amount. Being made up, therefore, of the lighter elements, they can more readily soar away into the air.

(From his Ten Books on Architecture)

Disclaimer: If you try using this quote as justification for throwing an alleged witch into a pond, then you’re on your own – this post is tagged under “error”…

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