Apr 22 1870 Vladimir Ilyich Ulyanov Lenin born, Simbirsk Russia.
Apr 22 1915The German Army opens 5,700 canisters of chlorine gas upwind of French soldiers at Ypres. It is the first use of poison gas for military purposes.
Apr 22 1923Kinky centerfold model Bettie Mae Page born in Nashville, Tennessee. As she describes herself, "I was never the girl next door."
Apr 22 1934John Dillinger's gang shoots their way out of an FBI ambush outside the Little Bohemia Hunting Lodge in northern Wisconsin. The FBI accidentally kills one innocent bystander and injures two others in the humiliating debacle.
Apr 22 1954Porn star and onetime Ivory Snow model Marilyn Chambers is born in Westport, Connecticut.
Apr 22 1992215 people are killed and 1,500 injured when two miles of sewer lines explode in Gaudalajara, Mexico. 20 city blocks in the downtown area are leveled by the blast. A corroded petroleum pipeline had filled the sewer with explosive fuel.
In September 1969 at a conference in Seattle, Washington, U.S. Senator Gaylord Nelson of Wisconsin announced that in spring 1970 there would be a nationwide grassroots demonstration on the environment. This occurred during a time of great concern about overpopulation and when there was a strong movement towards
"Zero Population Growth".
Responding to widespread environmental degradation, Gaylord Nelson, a United States Senator from Wisconsin, called for an environmental teach-in, or Earth Day, to be held on April 22, 1970. Over 20 million people participated that year, and Earth Day is now observed each year on April 22 by more than 500 million people and national governments in 175 countries.
http://en.wikipedia.org/wiki/Earth_DayStill no word on why Senator Nelson (D-WI) picked that particular day.