Curing rickets will become possible

Gregory Benford : science fiction author and astrophysicist
American scientists have discovered that the ultraviolet rays from the sun can cure children of rickets. Artificial sunshine lamps in clinics will help dull, stunted boys and girls put on weight, straighten up and become quick and intelligent in their movements.
Children still get rickets, especially in developing countries, and sunbathing—in natural or artificial sunlight—combined with vitamin D and calcium supplementation will cure them.

GREGORY BENFORD, Popular Mechanics, (2012), "The Future That Never Was: Pictures from the Past', [online], Available: