Fifty years ago this month, on a foggy Saturday morning in Cambridge, England, a 24-year-old beanpole of an American scientist (Watson) sat down with a few white cardboard cutouts and set off a revolution in biology.

• 五十年前的二月，在英国剑桥大学星期六一个雾蒙蒙的早晨，一位24岁清瘦高挑的美国科学家坐在一堆裁剪出的纸板块旁，他由此引发了一场生物学领域的革命。