Duolingo, Inc. (DUOL) has had an impressive run in the past year. The company’s shares have gained 57.5%, significantly outperforming the 25% growth of the Zacks S&P 500 Composite.Let’s take a look at some other factors that make the stock an attractive pick.Solid Rank: Duolingo currently sports a Zacks Rank #1 (Strong Buy). Our research shows that stocks with a Zacks Rank #1 or 2 (Buy) offer attractive investment opportunities for investors. Thus, the company appears to be a compelling investment proposit ...