Taking as its focus the deceptively simple questions, How has the world’s population changed over time? and How will it change in the future?, this engaging website (designed as a companion to the television program) developed by NOVA explores both of these queries through a set of interviews, interactive features, and additional resources, such as weblinks and guides for teachers. The interviews are enlightening, and feature transcripts of conversations with Ding Yihui on climate change in China, Geeta Rao Gupta on the status of women in India, and Lester Brown on population growth. The section on population control campaigns and family planning are particular nice, as they profile, through brief essays and posters, the attempts of India, China, and Kenya to promote these policies. As mentioned, the interactive features are very well-though out, and allow visitors to examine the growth of the human population from the year zero to 2050 and to take a quiz on population trends and environmental challenges.