Big Smile, No Teeth: Live forever. Then what?笑容灿烂，牙齿缺失：长生不老。然后呢？
Survival gives us a purpose. So what is the human purpose in a world made easy by AI?
What would you do if you could live forever and no longer had to worry about everyday survival, wonders the columnist. — 123rf
Ray Kurzweil, the American futurist who has spent 50 years making predictions that sounded insane at the time and then annoyingly came true, speculates that humans could hit something called “longevity escape velocity” by about 2029.
The idea goes like this. Right now, every year you live, you lose a year. Medical science claws back about four months of it. But science is accelerating, and Kurzweil says that by around 2029 it will claw back a full year for every year you spend. At which point, mathematically speaking, you stop running out of time.
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Big Smile, No Teeth: Live forever. Then what?
专栏作家不禁发问：如果你能永生不死，再也不用为日常生存担忧，你会做什么？——123rf
美国未来学家雷·库兹韦尔（Ray Kurzweil）在过去 50 年里做出了许多当时听起来很疯狂，但后来却令人恼火地一一成真的未来预测。他推测，人类可能会在 2029 年左右达到所谓的“长寿逃逸速度”。
这个想法是这样的：现在，你每活一年，就相当于少活一年。医学进步大约能让你恢复四个月的生命。但科学正在加速发展，库兹韦尔说，到2029年左右，医学进步就能让你每活一年就恢复整整一年的生命。到那时，从数学角度来说，你就不再会感到时间不够用了。
笑容灿烂，牙齿缺失：凡事值得做，都不容易——这就是人生。
笑容灿烂，却无牙齿：当水源枯竭，警告才会出现。
笑容灿烂，牙齿缺失：但图书馆从未被烧毁。
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笑容灿烂，牙齿缺失：长生不老。然后呢？