tornado

Deadly tornadoes have wreaked havoc in the South, leveling homes and claiming at least 28 lives in the past three days. And meteorologists say the threat of more tornadoes won't ease up till Wednesday.

Getting to a safe place is the best thing that people can do to protect themselves and their families. That can mean a specially constructed concrete safe room, a basement, or just a ditch if you're caught outdoors.

When Randy Keller moved from Texas to the Oklahoma City area seven years ago, he couldn't find the house he was looking for.

"I was moving from Texas, where there are also a lot of tornadoes," says the professor of geology and geophysics at the University of Oklahoma who experienced the 1970 tornado in Lubbock, Texas. "But I just couldn't find one."