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熊大、熊二、光头强意外穿越回恢宏的石器时代，在原始部落与猛犸象、剑齿虎等一众奇特生物开启了眼界大开的奇幻之旅！原始时代瑰丽非常却又危机四伏，熊强三人组与一只可爱狼女一路相伴，笑料百出。原始部落纠葛不断，女族长竟对光头强情愫暗生……面对凶猛狼族的步步紧逼、原始人类的不断质疑、自然危机的全面爆发，熊强究竟何去何从？他们又能否回归现代？一场关于守护与成长、爱与勇气的冒险，拉开序幕……。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 ...。