Many years ago I was on a bicycle trip through some exceedingly picturesque countryside. Suddenly, dark clouds piled up overhead and rain began to fall, but strange to relate, several hundred yards ahead of me the sun shone brilliantly. Pedaling, however, as rapidly as I could, I found it impossible to get into the clear. The clouds with their rain kept advancing faster than I could race forward. I continued this unequal contest for an exhausting half hour, before realizing that I could not win my way to the bright area ahead of me.

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