How can you time the reaction timer?
Li Ching-Yuen was a Chinese herbalist and longevity expert who was known to have died in 1928. He claimed to have been born in 1734, giving him a lifespan of 196 years. Investigations into birth records indicated that he was actually born in 1678, giving an even longer lifespan of 250 years!
Whilst this may seem unbelievable, is it? In this question we use statistics to look into the lifespan of very old people.
Whilst there is no conclusive historical evidence to support the birth date of Li Ching-Yuen, the following data concerning lifespans are known [at the time of writing this question (October 2008); sources given below]
Extension: There are many statistical complications involved in predicting death rates. How many can you think of? How might these effect these statistics in future?