In 1995, a man named Shawn Nelson stole a tank from the US Army and took it for a joyride on a highway in California.
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Colorado switched mile marker "420" to "419.99" to stop people from stealing it.
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Anthony Greco, aged 18, became the first person arrested for spim (unsolicited instant messages) on February 21,2005.
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In March, 2014, Colorado sold $19 million dollars worth of Cannabis. $1.9 million went to schools and crime fell by 10%.
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