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Numedeon, the maker of kids' virtual world Whyville.net, launches SportsBlox, a digital environment for sports nuts, in a move to branch out into new markets.
Yardbarker (old slang for a home run) says it brought in new funding from Draper Fisher Jurvetson and angel investors including former Hall of Famer Ronnie Lott.
Media watchdogs and educators worry about the nascent industry having relatively no standards for advertising.
Venture capitalists are showing more interest in 3D playgrounds for kids online since Disney bought the virtual world Club Penguin for $350 million earlier this year.
Virtual worlds like Whyville give kids chance to learn about science, math and themselves. Educators are taking notice.