Zombie fad grows when people are unhappy

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Zombies are everywhere these days, and according to one English professor, that's no accident.

Sarah Lauro, a visiting assistant professor at Clemson University in South Carolina, says there's a correlation between the popularity of zombies and unhappiness in society.

"Zombie walks," the name given to groups of people that get together styled like the undead, first rose to popularity in Toronto in 2003 and 2005, when anger and dissatisfaction escalated over the Iraq War.

Lauro, who has spent a decade studying undead culture, pointed to the popularity of the genre during the Great Depression in the 1930s, when workers suffered in a struggling economy, the Cold War and the threat of nuclear holocaust, and even the space race.