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Lulu and Judy Geeson continue their earlier roles and come to the farewell party. Thackeray announces that he is leaving for an inner-city school in Chicago where he will teach again. In Chicago, he meets a former colleague who is the principal of the school. Thackeray learns that there is an A class with good students and an H (for "horror") class for the no-gooders. He convin...。NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。沈叶初和女儿宋惜惜与宋柏简的白月光江揽月同时在高速上出了车祸,外科手术医生的宋柏简却因为小时候的救命之恩,选择救了伤势较轻的江揽月母女从而害死了女儿。在得知女儿死讯后,宋柏简难以接受并将责任都怪到了沈叶初身上。沈叶初意外发现宋惜惜死亡的真相。