Knuckleball machine delivers soccer science

Wind tunnel and high-speed camera data help researchers to explore the zigzag secrets of one of football's most unpredictable shots and provide clues to much older scientific mysteries

Killer twisters likely among largest, strongest

Some of the killer tornadoes that ripped across the South may have been among the largest and most powerful ever recorded, experts suggested, leaving a death toll that is approaching that of a tragic "super outbreak" of storms ...

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