[pm90]

It was done by Feynman first (I had heard of it in 2007, before this video was published, when I was finding about Feynman after reading his classic "Surely you're .."). I don't think Lewin acknowledged that though

[inconditus]

Walter Lewin's been doing it since 198x, probably earlier.

[irahul]

http://articles.latimes.com/1989-03-12/news/ga-1006_1_feynma...

> He first encountered Feynman as a freshman in 1961 > On the first day of class, Scott recalled,