"In order to understand bird flight, we have to understand aerodynamics; only then does the structure of feathers and the different shapes of bird's wings make sense." -David Marr

A key principle of aerodynamics is Bernoulli's principle which relates speed of a fluid and pressure. This principle can be derived from conservation of energy but also directly from Newton's Second Law of Motion (F=ma).

Marr said the above quote in relation to studying the brain and how it works, which begs the question, what principles like conservation of energy are also in action in the brain? Conservation of energy is probably too broad since Bernoulli's principle breaks down if there's turbulence or thermal radiation and it's hard to imagine anything like laminar flow in the brain.

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