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Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.随即，几人便从学堂告辞出来。跟胡镇一块来的人急忙点头，期盼地望着板栗。　　君臣二人一心玩乐，荒废朝纲，致使举国上下怨声载道，强梁四起。以及时雨宋江（李雪健 饰）为首的一八零八位好汉相继登上梁山，一众好汉闹江州、三打祝家庄、战青州。搅得大宋江山沸沸扬扬……现代女医生遭遇车祸，绝世美女也就罢了，竟然穿越古代成为人人喊打的叫花子。刚来就被抓进青楼，却意外得知这青楼的主人居然是当朝太子？不过救醒我的这位师父也太禁欲了。腹黑傲娇冰山公子？温润如玉暖心师父，看我一个一个吃抹干净！"Deliberate practice" also breaks the superstition of the "10,000-hour law". In fact, the "10,000-hour law" is not strictly rigorous, but it is very popular because of a quantitative number.