http://www.thepeoplehistory.com/april7th.html
2001 - U.S.A. Mars Odyssey
2001 : The Mars Odyssey spacecraft took off on a six-month, 286-million-mile journey to the red planet. It reached Mars on October 24, 2001. It is designed to orbit the planet Mars to hunt for evidence of past or present water and volcanic activity to help answer the question of whether life has ever existed on Mars.
1906 - Italy Mount Vesuvius
1906 : Mount Vesuvius erupted causing gray ash and liquid lava erupted from the volcano burning homes built on the hillsides as it continued down the mountain.
1933 - U.S.A. Beer Available Again
1933 : After years of prohibition since Midnight of January 16, 1920 when the Eighteenth Amendment was put into effect which included importing, exporting, transporting, selling, and manufacturing of intoxicating liquor illegal. On This Day 1933 beer is sold once again in 19 of the 48 states and the District of Columbia.
More about the 21st Amendment
1940 - U.S.A. Annular Solar Eclipse
1940 : An Annular Solar Eclipse is seen for the first time in North America since 1930 and the sun was blocked completely out for 6 to 7 minutes by the moon with a narrow circle of brilliance around it's rim. A solar eclipse is when the moon gets between the earth and the sun during it's orbit. Austin in Texas had the closest to a full eclipse with 93% of the sun covered at 3.16 PM followed by Tallahassee in Florida at 6.22 PM.
1948 - Switzerland World Health Organization
1948 : The World Health Organization (WHO) established as a specialized agency of the United Nations (UN) that acts as a coordinating authority on international public health.
1954 - U.S.A. Cold War "Domino Theory"
1954 : President Dwight D. Eisenhower coins the Cold War phrase when he suggests the fall of French Indochina to the communists could create a "domino" effect in Southeast Asia. The so-called "domino theory" dominated U.S. thinking about Vietnam for the next decade.
1963 - Yugoslavia President Tito
1963 : Tito is named as the president for life of the newly named Socialist Federal Republic of Yugoslavia.
1969 - U.S.A. Stanley v. Georgia
1969 : The US Supreme Court rules on Stanley v. Georgia " 394 U.S. 557 (1969) " on the grounds of the 1st and 14th Amendments declaring "The State may not prohibit mere possession of obscene materials for personal use" and helping to define personal "right to privacy" in U.S. law.
1978 - U.S.A. Neutron Bomb Production Put On Hold
1978 : President Carter delays Neutron Bomb production. The Neutron Bomb is designed to kill people while minimizing damage to property unlike a conventional nuclear missile which destroys everything in it's path, this is achieved by producing a small blast but massive amounts of lethal radiation.
1986 - England Sinclair ZX Spectrum
1986 : Sir Clive Sinclair has sold the marketing and merchandising rights to his inventions which include the ZX Spectrum for £5m to computing rival Amstrad. Sir Clive Sinclair a brilliant inventor who introduced miniature televisions, pocket calculators and digital watches to Britain in the 1960s and 1970s, and the ZX80, a home computer priced at less than £100 in 1980, following on was the Sinclair ZX Spectrum which was the most popular home computer sold in England and was sold in the US as the TS2068 from Timex.