On this day in 1952, an atomic test conducted in Nevada is the first nuclear explosion shown on live network television, and annihilates the competition.

On this day in 1954, the televised Senate Army-McCarthy hearings begin, sponsored by "Welch's Grape Juice" and "The New Army." (see June 9)

On this day in 1970, millions of Americans concerned about the environment observe the first "Earth Day." The cleanup takes a week.

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