J. E. Littlewood, a mathematician at Cambridge University,....

“ J. E. Littlewood, a mathematician at Cambridge University, wrote about the law of truly large numbers in his 1986 book, "Littlewood's Miscellany." He said the average person is alert for about eight hours every day, and something happens to the average person about once a second. At this rate, you will experience 1 million events every thirty-five days. This means when you say the chances of something happening are one in a million, it also means about once a month. The monthly miracle is called Littlewood's Law. ”

David McRaney

From : You Are Not So Smart: Why You Have Too Many Friends on Facebook