Warren Buffett (left), Howard G. Buffett (center) and grandson Howard W. Buffett collaborated on a book about the challenges of feeding more than 2 billion more mouths by 2050. Scott Eells/Bloomberg/Bloomberg via Getty Images hide caption

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Scott Eells/Bloomberg/Bloomberg via Getty Images

Joey Prusak has been a busy man since his act of kindness went viral. CBS Minnesota is among the TV outlets that have spotlighted his story. Minnesota.CBSlocal.com hide caption

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Howard Buffet on his 1,400-acre research farm in Wilcox, Ariz. Buffett, the son of billionaire investor Warren, is working to find permanent solutions to the world's hunger problems. Nick Oza for NPR hide caption

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Nick Oza for NPR

Howard Buffett Battles Hunger, Armed With Money And Science

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Warren Buffett's Berkshire Hathaway announced that the billionaire investor has been diagnosed with prostate cancer. Seth Wenig/AP hide caption

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Seth Wenig/AP