The Truth Behind Common Misconceptions

We ask ordinary people on the streets around the US about common knowledge -- and find that they are really common misconceptions. Do you know what the life expectancy was in the Middle Ages? Or how much alcohol gets cooked out of food? Can you name the human senses? We cover those topics, and more.

Dave Johnson is editor of eHow's Tech channel, and the author of about 3 dozen books, including the best-selling, "How to Do Everything with Your Digital Camera." He has appeared in dozens of magazines and websites, including PC World, Wired, and CBS MoneyWatch.