On a temperate and sunny spring day in Boston a departure from last year's scorching near-90-degree conditions the women's elite race got off to an especially slow start, with a 6:04 first mile.

WSJ: Jeptoo, Desisa Win Boston Marathon

Writing about his work earlier this year in Virology Journal, Rice shows how chickenpox is much less common in parts of the world with high levels of UV rays compared with places where the levels are low, and why in temperate zones, the disease peaks in winter and spring, when UV rays are at their lowest.

FORBES: Sun's UV Rays May Prevent Chickenpox