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人为什么会笑？笑的本质是什么？笑声在社交中有什么作用？大脑能分辨真笑和假笑吗？存在全世界通行的喜剧吗？

　　叙利亚的平民日日遭空袭重创之际，一群不屈不挠的第一线因应人员冒着生命危险，从瓦砾堆中救出受害者。

In this four-part series for BBC Two, Professor Joann Fletcher explains how Ancient Egypt’s extraord

What is it like to experience the incredible journey that takes place during the baby’s 1st year? Th