Worried about the swine flu? Clark wants to set a little perspective to calm your fears.

Back in 1918, there was a brutal influenza that followed on the tail end of World War I. At the time, 1 in 3 people on Earth got the flu. The best estimates suggest that it ultimately killed twice as many people as World War I.

The only other precedent in human history had been the Black Plague during the medieval era.

There were no medications available to treat the flu epidemic of 1918. Nor was there any real ability to do lab work and verify what illness someone had. But today we have all these capabilities.

Rewind a few days to Sunday and very few people had heard about swine flu. Suddenly, the news about it is all over the place today. There's a dangerous middle ground between having no knowledge on one hand and having constant coverage on the other hand. Remember, TV producers want to tease you to watch the next segment with headlines that can trigger fear.

So Clark's advice is to chill for now. Know that our nation will take precautions as necessary and we're in better shape than we might have been in a different era.

And when all this is over, the deals in the travel market to areas that people are afraid to visit will be amazing.