问HN：有哪些小点子可以让世界变得更美好？
我在寻找一些好的、具体的想法，关于如何在日常生活中以小方式对世界产生积极影响。<p>你认为有哪些投入产出比最高的方法，可以让尽可能多的人生活得更好？
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I’m looking for some good, specific ideas on small ways to have a positive impact on the world on a daily basis.<p>What do you consider to be the highest return-on-efforts ways to make the world a better place for as many people as possible?