Where Did We Come From?

Host Neil deGrasse Tyson will tackle one of science's major challenges in each video, framed as a simple question that ordinary people wonder and worry about. Neil will guide us as he explores dramatic discoveries and the frontiers of research that connect each central, provocative mystery. Episode includes: 1) Origins of the Solar System - The shock wave from a supernova may have triggered the formation of our sun and planets five billion years ago. 2) Revealing the Origins of Life - How did molecules first make the leap from non-living to living? An English chemist may have solved part of the mystery. 3) Lice and Human Evolution - Icky and itchy, yes, but lice happen to hold important clues to human evolution in their DNA. 4) Profile: André Fenton - Can we erase bad memories with a shot? A neurobiologist says we can-and thinks Alzheimer's patients could benefit.