What to stop worrying about ?

According to David Ropeik of Harvard Center for Risk Analysis, people's fear are often out of proportion with actual risk. For instance, people are scared of sharks attack, but the odds of becoming a shark snack are only 1 in 3.7 million. In contrast, the odds of dying in a car crash are 1 in 88, but few people are afraid to drive. Sharks attack stick in our heads because they are rare and make news. For car accidents, we are so used to it that we no longer sensitive to it.

In 2002-2003, SARS has killed 774 people(none in US), yet it's scary, since it's unfamiliar. Good old influenza doesn't faze us as much, but in the US it kills 36,000 a year.