斯坦福博士生Anqi Li在微软实习期间完成这项研究，导师Henry Cohn本意是让她用计算机辅助，她却创造性地找到了数学上的新解法。 这个问题在低维很直观，比如二维空间的“亲吻数”是6，如果在桌面上摆一枚硬币，很快就能试出来周围最多还能摆6枚硬币。 另外，这个问题还与通信领域的编码纠错问题密切相关，曾被NASA用来设计旅行者号探测器的通信编码： ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.