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In
this Saturday, May 6, 2017 photo, Olympic marathon champion Eliud Kipchoge
crosses the finish line of a marathon race at the Monza Formula One racetrack,
Italy. Eliud Kipchoge was 26 seconds from making history on May 6. Nike and
Adidas have announced separate plans to attack the 2-hour marathon, with both
introducing shoe lines linked to the effort. Wireless tech giant Vodafone last
month said it was backing a third bid, hoping data gleaned from the quest will
translate into wearable technology. (AP Photo/Luca Bruno)
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For distance runners,
it's a mystical goal equivalent to the four-minute mile that Roger Bannister
broke in 1954; a test so difficult some have estimated it may be 50 years or
more before anyone achieves it.