Hypothesis Testing - II

A comment I posted on a blog:

[previous commenter] has a good point, and I see this sort of thing all the time in medical research. Do you think the life expectancy of people who drink Coke is *exactly* equal to the life expectancy of people who drink Pepsi? Exactly equal? Of course not. If you sample enough people, eventually you will detect a "statistically significant" difference. Then you can publish your paper saying e.g. "we found that people who drink Coke live significantly shorter lives than people who drink Pepsi!" Or, as it would appear in the newspaper and on tv: "Coke Kills!!"