Engineering the perfect cookie: You can control the diameter and thickness of your favorite chocolate chip cookies by changing the temperature of the butter and the amount of flour in the dough.
A young girl stands in the doorway of a home in Uttar Pradesh, India. The markings on the door show that a polio immunization team vaccinated children in the home.
Alyce Henson/Courtesy of Rotary International
Sonny Vaahn, 25, holds his family's refugee identification in Bronx, N.Y. The card was issued to them during their initial entry into a refugee camp along the Thai-Cambodian border after the "killing fields" atrocities ended in Cambodia.
Courtesy of Pete Pin