PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Runners in a race. Runners climbing Hayes Street hill during the Bay to Breakers annual race in San Francisco, USA. The Bay to Breakers race began in 1912 to lift the city's spirits after the 1906 San Francisco earthquake. It is 7.46 miles long and is traditionally run on the 3rd Sunday in May.
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