Mandela and Feynman were born the same year. 1918. But while Feynman passed away in 1988, Mandela this year, it gives Mandela 25 more years to live (about 95 years old, Mandela). Thats a nearly 25% difference. What makes such wide disparity in how long people live?
On afterthoughts, (from this) statistics is a way of hiding our ignorance by allowing more and more attributes into a particular question, to the level our ignorance is no more useless. Thats the difference between science and religion: statistics. Statistics is the difference between science and religion. Religion brushes everything with one broom. Science needs various sizes for various tasks. In the end there is a difference even if its not so visible.
The only thing I am leaving for you to search is statistics, do a Google image search. Well let me do that for you as-well. tum bhi kya yad karoge.