David's fascination with tornadoes stems from a monster twister in 1979.

Do tornadoes skip? Experts say no. Sometimes a tornado's damage path appears irregular, leaving some buildings demolished but others in the same path relatively undamaged. This gives the impression the funnel skipped over the less-damaged buildings.

Does size matter in a tornado? In other words, do the biggest tornadoes produce the strongest winds and thus the most damage? One prominent tornado researcher says "yes, bigger equals stronger".