Opal and Oda Hall (born 1910)

In 1910, in the year that Opal and Oda Hall was born, Halley's comet, which returns past the earth every 75 - 76 years was observed photographically for the first time. Two fortuitous events occurred - photography had been invented since the last time the comet had passed and the comet was relatively close. There was panic because one astronomer claimed that the gas from its tail "would impregnate the atmosphere and possibly snuff out all life on the planet." People bought gas masks, "anti-comet pills" and "anti-comet umbrellas".

In 1925, gangster Al "Scarface" Capone took over the Chicago bootlegging racket at age 26. Previously right hand man to boss Johnny Torrio, Capone took over when Torrio was shot and severely injured and decided to resign. The bootlegging and brothel organization was massive and when asked what he did, Capone often replied "I am just a businessman, giving the people what they want".

In 1937, on May 28th, the San Francisco Golden Gate Bridge opened to cars. Taking 5 years to build, the 4,200-foot-long suspension bridge was an engineering marvel of its time - 11 men died during construction. The "international orange" color was chosen because it resisted rust and fading. To the present, it is the symbol of the City that is known throughout the world.

In 1949, on April 4th, NATO (the North Atlantic Treaty Organization) was established. Twelve nations originally signed the North Atlantic Treaty - the United States, Great Britain, France, Belgium, the Netherlands, Denmark, Italy, Luxembourg, Norway, Iceland, Canada, and Portugal. Greece, Turkey, and West Germany later joined. Today, there are 26 nations in NATO.

In 1976, The United States celebrated the Bicentennial of the adoption of the Declaration of Independence. It was a year long celebration, with the biggest events taking place on July 4th.