San Francisco has several nicknames, including “The City by the Bay”, “Golden Gate City”,[25] “Frisco”, “SF”, “San Fran”, “Fog City”, and as well as older ones like “The City that Knows How”, “Baghdad by the Bay”, “The Paris of the West”, or simply “The City”.[16] As of 2017, San Francisco is ranked high on world liveability rankings.[26]

San Francisco was founded on June 29, 1776, when colonists from Spain established Presidio of San Francisco at the Golden Gate and Mission San Francisco de Asís a few miles away, all named for St. Francis of Assisi.[1] The California Gold Rush of 1849 brought rapid growth, making it the largest city on the West Coast at the time. San Francisco became a consolidated city-county in 1856.[18] After three-quarters of the city was destroyed by the 1906 earthquake and fire,[19] San Francisco was quickly rebuilt, hosting the Panama-Pacific International Exposition nine years later. In World War II, San Francisco was a major port of embarkation for service members shipping out to the Pacific Theater.[20] It then became the birthplace of the United Nations in 1945.[21][22][23] After the war, the confluence of returning servicemen, massive immigration, liberalizing attitudes, along with the rise of the “hippie” counterculture, the Sexual Revolution, the Peace Movement growing from opposition to United States involvement in the Vietnam War, and other factors led to the Summer of Love and the gay rights movement, cementing San Francisco as a center of liberal activism in the United States. Politically, the city votes strongly along liberal Democratic Party lines.

Radon gas – even the name sounds ominous, evoking images of radiation and nuclear devastation. Radon gas is created when uranium in the soil decays. The gas then seeps through any access point into a home. Common entry points are cracks in the foundation, poorly sealed pipes, drainage or any other loose point. Once in the home, the gas can collect in certain areas – especially basements and other low-lying, closed areas – and build up over time to dangerous levels. The Environmental Protection Agency of the US Government has set a threshold of 4 pico curies per liter as the safe level. As humans are exposed to the gas over a period of years, it can have a significant and detrimental effect.