it can advance to periodontitis, a more serious oral health issue that is not reversible (without surgery) and can include bone and tooth loss. Gum disease is one of the leading causes of tooth loss among adults. In recent studies it has also been linked to...
The 1958 recession signaled the sharpest economic downturn during the generally prosperous era between World War II and the 1970s. Many industries were deeply affected during this time, with the automobile industry as a prime example. 1958 was the worst year for automotive workers since the industr...
periodontal ligaments, and jaw bone. Once the supporting structures of the teeth are destroyed, they do not grow back. Periodontal disease is not reversible, nor is there
The RCA Victor tape cartridge was created to offer recording quality in a convenient format for the consumer market. After four years of development, the reversible cassette was launched in sync with the introduction of the stereophonic phonograph record. The cartridge didn’t take off as planned,...
It came in on a wave of anti-immigration hysteria following a series of events including the 1919 recession and the resulting high unemployment rates and governmental policy at the time of isolation. [Pictured: Newly arrived European immigrants at Ellis Island in 1921.] 1922: The Cable Act ...
The RCA Victor tape cartridge was created to offer recording quality in a convenient format for the consumer market. After four years of development, the reversible cassette was launched in sync with the introduction of the stereophonic phonograph record. The cartridge didn’t take off as planned,...
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