Kelly Koshuta, a basketball star at James Madison High School, Vienna, Va., had surgery to repair an anterior cruciate ligament injured in 2012. Sarah L. Voisin/The Washington Post hide caption

itoggle caption Sarah L. Voisin/The Washington Post

Carol Downing is still haunted by memories of last year's marathon. But she's excited about reuniting with other survivors. Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP

Volunteers with lower levels of blood sugar stuck more pins in voodoo dolls of their spouses than people with higher levels. Courtesy of Brad Bushman hide caption

itoggle caption Courtesy of Brad Bushman

The most healthful loaves of bread contain chunks of grain still intact, like the seeded loaf on the right. Whole wheat loaves, like the one in the middle, may contain few whole grains and may be made up mostly of refined flour, like the white bread on the left. Meg Vogel/NPR hide caption

itoggle caption Meg Vogel/NPR

Laurel Francoeur's son Jeremy is severely allergic to peanuts, tree nuts, eggs, soy, sesame and shellfish. Courtesy of Laurel Francoeur hide caption

itoggle caption Courtesy of Laurel Francoeur