CHICAGO (AP) — An activist speaking out about inadequate waste and water sanitation in rural America, an author of young adult and children's literature reflecting the world's diversity, and a neuroscientist who used mathematics to study the brain's development are among the 21 recipients of this year's "genius grants".

The John D. and Catherine T. MacArthur Foundation announced the fellowships Tuesday. Each will receive $625,000 over five years to spend as they please.

Writers, sociologists, scientists, a documentary filmmaker, a legal scholar and an environmental health advocate are among th...