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I think how trains stay on tracks [0] is also a good example of this. [0] https://www.popularmechanics.com/science/a25581/science-behind-train-tracks-wheels/ h

• iainmerrick 8y ago
  Yes! I coincidentally just learned about that topic recently. What’s great about that problem is that it isn’t obvious that there even is a problem in the first place. “How do trains stay on tracks? Well... they have wheels, don’t they?” Then when the problem is explained, it sounds impossible. The solution you first think of is probably wrong.