style="overflow: hidden; color: #000000; background-color: #ffffff; text-align: left; text-decoration: none; border: medium none;">Warren Buffett, the 82-year-old Sage of Omaha, was once described as a “five-sigma event” – an investor so successful that he defied the laws of probability. The chance of someone steadily boosting the value of his company by 20 per cent a year for half a century was one in 3.5m.