The documentary depicts monarch butterflies’ great and mysterious migration. Each year’s autumn, millions of monarch butterflies start their incredible southward migration from Canada, cross America, to Mexico. They fly above 2,000 miles to arrive the mountain of Mexico .....
The film opens with caterpillars munching milkweed in southern Canada in late summer. Soon each caterpi...
Nova ScienceNow examines the question of whether we can live forever. It looks scientists who are exploring hibernation and building organ replacements and profiles computer scientist Jason Leigh.
生物学正进入一个新的时代，一个不朽的时代。随着医疗技术的进步，我们终于能够提出一个令前人匪夷所思的问题：我们可以长生不老吗？我们可以治疗疾病，更换身上坏死的器官，甚至让健康科学上升到基因学的高度。所以的这一切能够为人类带来永生吗？同时，我们应该这么做吗？
