數十億年前，人類還沒能漫步地球；數十億年前，恐龍甚至都還沒演化出來，地球上就已經喧喧嚷嚷地擠滿生命了！單細胞的有機體將汪洋大海蒸騰成一鍋翻攪的什錦湯，活生生的動物在土壤大地上匐匍行走，這些生命從何而來？究竟何謂「生命」呢？生命是化學、心靈，還是兩者的綜合體？遙遠的星球上會不會像地球一樣擠滿了生物？而生物又是如何從單細胞的有機體進化成擁有數以兆計細胞的複雜生命—例如人類？
Billions of years before man first walked the Earth, billions of years before even the dinosaurs existed, Earth was teeming with life! Single-celled organisms made a roiling soup of our oceans, and living creatures were crawling in our very soil. Where did it come from? What IS life, exactly? Is it chemical, spiritual, or a combination of both? Do distant planets teem with life just as Earth does? And how do you go from a single-celled organism to a trillion-celled organism like Man?
