At the applause, I assume he's having fun with me, so I give him a thumbs up and turn my attention back to the Tame Impala, trying to remember if I recharged my Garmin running watch, wondering if my wife actually picked up dinner or if she was being sarcastic when she said, "I got it, " during an afternoon phone call between meetings.

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Crop diseases drew his attention first, inspiring him to turn from forestry to plant pathology under Charles Stakman, a lifelong mentor, at the University of Minnesota.

ECONOMIST: Norman Borlaug

Republicans hoping to win the White House in the autumn, and Hillary Clinton, who is battling him for the Democratic nomination now, have every reason to turn attention from his call to action back to his relationship with an inflammatory pastor.

ECONOMIST: Barack Obama speaks about race