Last week Dayton had a shower of green rain. It stained a few citizens' clothes and left a greenish tint on some white-painted houses. The press reported that local scientists were mystified.
There is not really much mystery about green, red or other-colored rain. A quick-acting biologist could probably have proved with a few squints through a microscope that Dayton's rain got its color from algae (microscopic plants) sucked up by a tornado. Full-sized tornadoes can lift heavy objects (such as signboards) high into the clouds. Even little whirlwinds can vacuum-clean the surface of a pond and deposit its green scum many...
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