Selling Lessons Online Raises Cash and Questions By WINNIE HU, NYTimes
A venture by some teachers has led school officials to ask who owns materials developed for public schools.
Space Oddities and Singing Astronauts: Renewing Interest in Space
Exploration
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In this lesson we offer three activities inspired by the astronaut Chris
Hadfield's use of social media to renew flagging interest in space.
5 hours ago
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