Scenes of destroyed homes and businesses were common following the recent Oklahoma tornadoes. David Prevatt, a structural engineer at the University of Florida, says that improving resistance to tornadoes will require better building materials and techniques, plus a strong dose of political will.
Some 45 trillion gallons of water are lost each year with all of the food that's thrown out around the world, according to a report from the World Resources Institute. This represents a staggering 24 percent of all water used for agriculture.
Audie Cornish talks to atmospheric science professor Kevin Knupp from the University of Alabama, Huntsville, about an unusual blob that hovered on the local weather radar for nine hours earlier this week.
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