[personal profile] aphar
answer: BOTH

http://www.guardian.co.uk/books/2008/nov/15/malcolm-gladwell-outliers-extract

...By the age of 20, the elite performers had all totalled 10,000 hours of practice over the course of their lives. The merely good students had totalled, by contrast, 8,000 hours, and the future music teachers just over 4,000 hours...

...Recently Forbes Magazine compiled a list of the 75 richest people in history. It includes queens and kings and pharaohs from centuries past, as well as contemporary billionaires such as Warren Buffet and Carlos Slim. However, an astonishing 14 on the list are Americans born within nine years of each other in the mid-19th century. In other words, almost 20% of the names come from a single generation - born between 1831 and 1840 in a single country. The list includes industrialists and financiers who are still household names today: John Rockefeller, born in 1839 (the richest of the lot); Jay Gould, 1836; and JP Morgan, 1837.
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