Cell phone jammer circuit (GSM1900 network)

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A mobile phone jammer circuit usable with GSM1900 and an effective frequency range of 1930 MHz through 1990 MHz. The GSM1900 network is used in Canada, South America, and the United States (T-Mobile and AT&T).

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Oldest known photograph of a human being dates back to 1838

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The black and white photograph depicting an early 19th century scene was taken by Louis Daguerre in 1838 on the streets of Paris, France. With a seven minute exposure time, two stationary humans were captured on camera, making it the oldest known photograph containing actual images of people. Oddly, there were likely many other people…

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