James Harrison was recognized in 2003 with the Guinness World Record for the most blood donated by one person. DAVID GRAY/Reuters /Landov hide caption

itoggle caption DAVID GRAY/Reuters /Landov

A group of mothers and infants celebrate a recent graduation from the Harlem Children's Zone Baby College program. Marty Lipp/Courtesy of Harlem Children's Zone hide caption

itoggle caption Marty Lipp/Courtesy of Harlem Children's Zone

Silvester Fullard fixes dinner for his 11-year-old son Tavestsiar. When Tavestsiar first came to live with his dad in 2010, he was closed off, Silvester says; "he didn't want to be around other kids." Charles Mostoller for NPR hide caption

itoggle caption Charles Mostoller for NPR

Does a glass or two of wine during pregnancy really increase the child's health risks? Epigenetics may help scientists figure that out. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

Arizona state Sen. Nancy Barto, R-Phoenix, listens during a special budget briefing at the state Capitol in October 2008. Barto sponsored a new law that prohibits wrongful birth lawsuits. She says the bill "sends the message that all life is worth protecting." Ross D. Franklin/AP hide caption

itoggle caption Ross D. Franklin/AP