450)=450">
Tal博士说，笑是有感染性的，如果你的笑感染了三个人，这三个人又感染了三个人，依次类推，只需要很短的时间，整个世界都会变得更加美好。Tal博士称此为“指数函数”的作用。
就像是蝴蝶效应： 一只蝴蝶在新加坡拍动翅膀，理论上却能在佛罗里达引起龙卷风！
“不积硅步，无以至千里”，如果你想要改变，则不要忽略细节，要从小事做起，事实上我们所做的每一件事都在改变世界，问题是你选择的是哪个方向。

How many times do you think you need to roll over the piece of paper for the piece of paper to reach the moon? The moon, 240,000 miles away from us. How many times do you need to fold the piece of paper so that you can reach the moon? 41 times. So if you can have a piece of paper here, and you fold it 41 times by the end of the class, you can reach the moon. I don't know why they make such a big deal out of you know person landing on the moon. Seems quite simple to me. And here is the point. We underestimate our capacity to affect change. Because we underestimate the growth of exponential function. We're influencing people and the world every minute of our lives. The question though is in which direction are we going to do it.

你们认为需要将纸折叠多少次，才能碰到月亮？月亮离我们24万英里，需要折纸多少次，才能碰到月亮？41次！如果你们有一张纸，再在下课之前折叠41次，你就能碰到月亮。我不理解人类登月有什么大不了的，在我看来很简单。得出的结论是，我们低估了改变的能力。因为我们低估了指数函数的增长。我们活着的每分钟都在影响世界和他人。问题是我们选择哪个方向。

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