This week, Rick Rule, founder of Sprott Global Resource Investments, Ltd., joins S&A Investor Radio and shares his favorite junior mining stocks to buy right now.You'll hear Rick go through what he looks for when choosing commodity stocks and explain why prices for a few commodities have to move much higher over the next few years...And... find out why Rick says he is tip toeing into the Russian market...Then, Frank goes through the "sell in May and go away" mentality, the biggest topic right now on CNBC...Plus, he reveals why a particular sector will be headed much higher in the months and years ahead even though now it is trading at a 52-week high...