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Adam Towle, 37, of Solana Beach, Calif. dissolves electrolytes in water as he runs in the third segment of the MS Run the US, a 3,000 mile relay run from Los Angeles to New York City, in Las Vegas Tuesday, April 30, 2013. MS Run the US is a non-profit organization committed to raising disease awareness and funds to further research in the fight to end multiple sclerosis (MS).

Steve Marcus