光与水的智慧光是节约时间的典范，它永远以最短路径行进。在真空中，光以30万千米/小时的速率沿直线传播;反射时，光所走过的路线，入射角等于反射角;折射时，入射角与折射角的比例，与两种介质的折射率保持着特定关系。光的行为，取决于介质的根本结构，光在介质中始终以“阻力最小”的方式传播，任何一条其他路径都是“弯路”。
再来观察水。水的智慧，远非世间常人所能及。河道宽，则水流缓慢;河道窄，则水流湍急;水的行进路线也取决于河道结构，或直或弯。若水流遇到一块巨石拦路，它不会去“努力翻越”，而是明智地绕道而行。
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