@khanacademy just signed up for the app today. Is it really free, and if so how? I can help with #Meteorology if interested.
Yep! We are powered by community donations, philanthropy and partnerships. Find out how you can get involved here: https://www.khanacademy.org/contribute 
-
-
Thanks for all your hard work! I will definitely check out this link.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.