Now that's a big root: Sweet potatoes aren't tubers, or thickened stems, like potatoes. Sweet potatoes are roots — swollen and packed with starch. U-ichiro Murakami/Flickr.com hide caption

itoggle caption U-ichiro Murakami/Flickr.com

When Dr. Bina Valsangkar had a miscarriage in India, she received state-of-the-art medical care. But just a few miles from the hospital she visited, nurses were struggling to keep up with sick patients. Courtesy of Save the Children hide caption

itoggle caption Courtesy of Save the Children

Bob Skierski at the beach in Avalon, N.J., just hours before he fell ill and went to the hospital. He never went home. Courtesy of Jennifer Rodgers hide caption

itoggle caption Courtesy of Jennifer Rodgers

Of I Wish You the Sunshine of Tomorrow, Rodgers says: "The ICU room my dad was in on the day he died had yellow walls. Every time we visited him we had to wear hospital gowns that were a bright yellow. [It] was a recurring color in that whole time frame of my life." Courtesy of Jennifer Rodgers hide caption

itoggle caption Courtesy of Jennifer Rodgers

ResearchKit, presented by Apple's Jeff Williams in March, enables app creation to aid medical research. Eric Risberg/AP hide caption

itoggle caption Eric Risberg/AP