www.pbs.org/humanspark Put to work at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, Alan Alda finds out how children will help -- and like it, while chimps are less inclined to offer enthusiastic assistance. In "The Human Spark," Alan Alda visits dozens of scientists on three continents -- and even undergoes an examination of his own brain -- to find the answer to one question: What makes us human? Coming to PBS over three Wednesdays: January 6, 13, and 20, 2010 (check local listings). Learn more, and tell us what YOU think makes us human at www.pbs.org/humanspark