It can't hurt to see where the smart money is going.

It's not cool to peek over the shoulder of the smartest kid in your class to see what answer she gave for question No. 7 on a test. In the same spirit, you might peek to see what some of the richest investors have been buying -- and that's far less problematic. It's natural, in fact, to wonder where the supposed smart money is going.

Here, then, are some relatively recent purchases made by some billionaires. I found them by checking their most recent 13F filings , which reveal purchases and sales.

1. Warren Buffett

Let's start with the most well-known of this bunch, Warren Buffett , who's famous for, among other things, growing the value of his company, Berkshire Hathaway ( BRK.A -0.13% ) ( BRK.B 0.14% ) , by an ann

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