PUT SOME ENGLISH ON IT: Rosetta Stone has acquired Boston-based Lexia Learning Systems for $22.5 million in cash, marking its first move beyond its the stronghold in the foreign language learning space. (Rosetta Stone acquired Livemocha in April 2013.) Founded in 1984, Lexia offers online English reading products currently used by over a million students across over 14,000 schools, and most recently scored a two-year deal with the state of Kansas for its Common Core reading program. The deal will not affect existing customers, assures the Lexia team, which will operate as a separate department under Rosetta Stone. According to the press release, Rosetta "plans to test the children's market on the consumer side," although a company representative declined to disclose further details.