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！"

I don’t look back, I keep moving forward.

理论上存在一种完美的幸福可能性：相信自身内不可摧毁的元素，而不必努力追求它。

Zombies are conceivable, and that tells us something important about consciousness.

沉默可以比言语更响亮，如果你懂得如何倾听。

一切都同样不确定。