Imagine that gravity and friction have suddenly been reduced to 25% of their current values. You wake up one morning, and there it is: You now weigh 50 pounds instead of 200, and everything works much more smoothly. Outside you can hear cars crashing and emergency vehicles arriving on the scene. You bound out of bed—and bang your head on the ceiling. What changes would you have to make? What wouldn't work anymore? What would be better? What would be worse? How chaotic would the transition be?
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