Marijuana gingerbread cookies, like this one sold at The Apothecarium in San Francisco, could easily appeal to kids. Jeff Chiu/AP hide caption

itoggle caption Jeff Chiu/AP

Teen boys are far less likely than girls to check out calorie counts before biting into that burger, researchers say. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Kaiba Gionfriddo, who breathes with help from a splint created by a 3-D printer, plays with his family dog, Bandit, at his Youngstown, Ohio, home. Mark Stahl/AP hide caption

itoggle caption Mark Stahl/AP

This model of a molar shows color-coded barium banding patterns that reveal weaning age. Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health hide caption

itoggle caption Ian Harrowell, Christine Austin, Manish Arora/Harvard School of Public Health

Luke Tanner, 7, gets vaccinated for measles at a clinic near Swansea, Wales, in April. Wales is at the center of a measles outbreak that has been linked to one death. Geoff Caddick/AFP/Getty Images hide caption

itoggle caption Geoff Caddick/AFP/Getty Images

Morgan Barnett, 7, drinks from containers of 1 percent milk and chocolate milk during lunch at a school in St. Paul, Minn., in 2006. Eric Miller/AP hide caption

itoggle caption Eric Miller/AP