何もしなくても「手数料」を得られるシステムを構築した国家が覇権を握る。出アフリカから現代までの「プラットフォーム」経済全史。

The power of an effective speech is undeniable. It has the capacity to engage, inform, motivate, and create change in an audience - and in the world. In this compelling 24-lesson course, How to Speak Effectively in Any Setting, taught by Molly Bishop Shadel, Professor of Law at the University of Virginia School of Law, learn the fine art of speaking clearly, effectively, and persuasively in contexts across the spectrum, from the board room to the bar room and everywhere in between.

Grammar! For many of us, the word triggers memories of finger-wagging schoolteachers, and of wrestling with the ambiguous and complicated rules of using formal language. But what is grammar? In fact, it's the integral basis of how we speak and write. As such, a refined awareness of grammar opens a world of possibilities for both your pleasure in the English language and your skill in using it, in both speech and the written word.

Chemistry and Our Universe: How It All Works is your in-depth introduction to this vital field, taught through 60 engaging half-hour lectures that are suitable for any background or none at all. Covering a year’s worth of introductory general chemistry at the college level, plus intriguing topics that are rarely discussed in the classroom, this amazingly comprehensive course requires nothing more advanced than high-school math. Your guide is Professor Ron B. Davis, Jr., a research chemist and award-winning teacher at Georgetown University.