Artur Duolingo, Inc. (NASDAQ:DUOL) has an interesting profile from a fundamentals perspective. On the one hand, it's a Top 10 performer in the Education Services sector within the broader Consumer Discretionary industry on the basis of its net income margin, and it's #1 in terms of revenue growth on a 3Y basis; but, on the other hand, its valuation seems to have run away from its fundamentals by a mile. In other words, that kind of performance is excellent, of course, but does it really justify a 9x forward ...