At that age， I'd take any excuse to make estimates and do minor arithmetic. I'd calculate our gas mileage -- figure out useless statistics on things like grocery spending. I'd been hearing an ad campaign about smoking. I can't remember the details， but basically the ad said， every puff of a cigarette takes some number of minutes off of your life: I think it might have been two minutes per puff. At any rate， I decided to do the math for my grandmother. I estimated the number of cigarettes per days， estimated the number of puffs per cigarette and so on. When I was satisfied that I'd come up with a reasonable number， I poked my head into the front of the car， tapped my grandmother on the shoulder， and proudly proclaimed， "At two minutes per puff， you've taken nine years off your life！"

我在大学的时候，一直想参与做能够改变世界的事情。而现在我就在做这样的事情。

I’ve never lost a game, I just ran out of time.

事理明白则心愈能清楚而专一，心能专一则事理愈能通达流畅。

The only meaningful way to study learning is through objective measurement.

想大事，想长远。最大的风险是不承担任何风险。