Where and when did humans arise? What distinguishes us from other species? Did our distant ancestors look and behave like us?
How has the amazing diversity of plants and animals evolved? What can fossils, butterflies, and stickleback fish tell us about the deep common ancestry of all living forms?
Leading evolution educator Ken Miller discusses the controversy surrounding the teaching of evolution.
Are we witnessing a sixth mass extinction? What factors threaten ecosystems on land and in the sea? What are researchers doing to try to conserve biodiversity and ecosystems?