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(Referring to the fears about the Mayan Calendar predicting the end of the world, and NASA’s attempt to debunk that fear).

As one of NASA’s prominent speakers on 2012 doomsday myths, Morrison said he receives many emails and letters from worried citizens, particularly young people.

Some say they can’t eat or are too worried to sleep. Others say they’re suicidal.

“While this is a joke to some people and a mystery to others, there is a core of people who are truly concerned,” he said.