German South West African Mark the gold content of the British Pound Sterling was 7.3224 grams, while the gold content of 20 marks was 7.168 grams. According to Gresham's Law, "bad money drives out good", so the "bad" Mark replaced the "good" British Pound Sterling. In 1901, the German Mark became the official currency of German South West Africa, hence replacing the 20 and 5 mark denominations of the German South West African Mark, for which they were also demonetized (although, they continued use in the metropolis of German South West Africa until 1907). In 1923, the coins of the German South West African Mark
Good Girls Go Bad Good Girls Go Bad "Good Girls Go Bad" is a song by American pop band Cobra Starship with guest vocals by Leighton Meester. It was the first single released from their third studio album, "Hot Mess". The song was released digitally through iTunes on May 11, 2009. On May 8, 2009, "Good Girls Go Bad" made its radio debut on KIIS-FM with Ryan Seacrest's show. The song was produced by former "American Idol" judge Kara DioGuardi and Kevin Rudolf. The song went on to become Cobra Starship and Leighton Meester's first US hit and top 10, peaking at number seven