RT @NASAglenn: The #Saffire-I sample ignites! Preliminary data indicates the sample burned for about 8 minutes. #NASAglenn .

RT @sciam: If the start of this year was anything to go by, 2016 is shaping up to be the year that science fights back .

RT @nytimesworld: Conflicts keep 24 million children out of school

RT @nytimesworld: Convoys enter besieged Syrian towns to deliver food

RT @StationCDRKelly: .@cnni and @CNNweather were just talking about this pollution in #India sitting up against the #Himalayas https://t.co….

RT @Denis44: Just checked in with @POTUS . you're not going to want to miss tonight's speech at 9p ET. Should be pretty sweet: https://t.….

RT @cnnbrk: Areas along Missouri, Mississippi rivers given dire warnings as rivers continue to rise. .

RT @nytimes: Eagles seeking coach who will interact well with others, CEO says

It seems to me, that if free online courses charged a small fee to enroll, the retention rates might go up. Sunk cost and all.