Is Boulder's Jenny Simpson the greate...

Is Boulder's Jenny Simpson the greatest American 1,500-meter runner ever?

Jennifer Simpson of the United States, silver, celebrates with the US flag after the Women's 1500 metres final during day four of the 16th IAAF World Athletics Championships London 2017 at The London Stadium on Aug. 7, 2017 in London, United Kingdom. Kenya's Faith Chepngetich Kipyegon celebrates winning as South Africa's Caster Semenya grabs third, and US athlete Jennifer Simpson second place in the final of the women's 1,500m athletics event at the 2017 IAAF World Championships at the London Stadium in London on Aug. 7, 2017.

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