32-year-old Erik Weihenmayer from Boulder, Colorado, became the first blind person to reach the summit of Mount Everest.
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A rainfall survey named 'It is raining plastic' announced that tiny plastic particles were found in 90% of rain samples in Colorado, US.
Ted Bundy escaped from jail.
Colorado became the 38th state to join the United States of America.
Aurora shooting leaves 12 dead, 70 wounded.
Colorado became the second US state to give women the right to vote.