In this lecture on power and propulsion systems, provided by the Massachusetts Institute of Technology, Space Shuttle engineer Henry Pohl discusses $10 million toilets, the difficulty in predicting fluid flows in microgravity, and the need for testing in a field where intuition can be a poor guide.
















































































































![A trajectory analysis that used a computational fluid dynamics approach to determine the likely position and velocity histories of the foam (Credits: NASA Ref [1] p61).](http://www.spacesafetymagazine.com/wp-content/uploads/2014/05/fluid-dynamics-trajectory-analysis-50x50.jpg)



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