A video shows St. Louis International Airport on Friday, April 20 as a tornado struck. Record numbers of tornadoes expected in the U.S. midwest and southeast.
Gallup survey shows that Americans are more likely to blame nature for global warming, the exception in a world where most residents blame human activity.
Scientists find that large earthquake clusters do not increase the global seismic hazard for other damaging earthquakes far from the main shock region.
Daniel Speiser led a study showing some small mollusks have evolved an unusual way to see the world, through hundreds of tiny eyes across their shells.