Warren Buffett is a gifted teacher who explains complex topics in a digestible format. This year he touched on Berkshire Hathaway’s massive cash hoard, among other items.

Warren Buffett is commonly regarded as the one of the greatest investors in American history. That's because Berkshire Hathaway ( BRK.A 0.56%) ( BRK.B 0.53%) stock has returned 19.9% annually since he took control six decades ago. Comparatively, the S&P 500 ( ^GSPC 1.12%) has returned 10.4% annually during the same period.