According to William Cline of the Peterson Institute for International Economics in Washington, DC, at least 4% of the world's grain is used to make ethanol for fuel.

"It's likely there are at least as many people with mild cognitive impairment as with Alzheimer's disease and maybe more, " said William Thies, the Alzheimer's Association scientific director.

"It's likely there are at least as many people with mild cognitive impairment as with Alzheimer's disease and maybe more," said William Thies, the Alzheimer's Association scientific director.