I love to get quick run about the topic that I'm about to learn.
There is lots of quality content available that could enrich Khan Academy like this: https://www.youtube.com/watch?v=ZM8ECpBuQYE&list=PL8dPuuaLjXtN0ge7yDk_UA0ldZJdhwkoV
Or the one that is already in: https://www.khanacademy.org/science/biology/crash-course-bio-ecology

It's much more easy to learn when you can get the bigger picture in short time before getting in to details. 

We would love you even more Khan Academy if you could include these courses. 
At last the main ones.  
Like: Physics, Sociology, World Mythology, Computer Science, Games, Physics, Philosophy, Economics, Intellectual Property, U.S. Government and Politics, Astronomy, Anatomy & Physiology, Big History, Bloopers & Outtakes, World History 2, Psychology, Chemistry, US History, Literature, World History

Sometimes the quick and quality 7 hour overview is all it takes to make the world a bit more intelligent in the topics that are out of our comfort zone. 

And we could all get some more points :)

Thank you