Not long ago I discovered this wonderful video on YouTube. The renowned linguist Steven Pinker speaks at Google's Mountain View, CA, headquarters about his book "The Stuff of Thought: Language as a Window into Human Nature." This event was a part of the Authors At Google series.
The main topics that Steven Pinker discusses are:
1. Grammar: A window into thought
2. Swearing: A window into emotion
3. Innuendo: A window into social relationships
The lecture is extremely interesting and if you have an hour to spare, please do watch this: it's worth seeing:)