TEACHERS PAY TEACHERS--LOTS: TeachersPayTeachers founder Paul Edelmen happily shares that his marketplace topped $10 million in overall sales this month. This year's payout to teachers this year from April through June: a cool $2 million. (And how are they spending it? Find out here.) The site first launched in 2006, but "sales were painfully slow for the first four years." It's a trying lesson that patience is key to gaining momentum in K-12 edtech. We hope y'all can stick it out!