You may not be able to speak German, Russian, or Tagalog, but if you're an investor, you know that in this age of globalization, foreign-language education has become big business. And there is no hotter language-software brand out than Rosetta Stone (NYSE: RST). You know all those airport kiosks stacked high with yellow boxes guaranteeing to teach you the tongue of your choice by the time you land in Denver? Those are Rosetta Stone products, and they're everywhere.

Motley Fool Stock Advisor analyst Matt Argersinger believes the ubiquity of the Rosetta Stone name translates to an extraordinary opportunity for investors -- especially now. Language software is a $32 billion market worldwide, and while the company enjoys a healthy slice of the U.S. trade, it controls only 2% of the international pie.

That spells upside -- with the accent on up. With 100% annual growth rates overseas, Rosetta Stone is expanding at exhilarating pace. And with the stock trading below where it IPO'd a year ago, this might well the perfect time to start speaking small-cap.