If you’re running a subscription site with thought-leaders in your niche, you’re going to want to take a page from Thinkwell’s playbook.Thinkwell, founded by Amy Bryant and Dan Heath in 1997, creates wonderful online video courses covering math and science. When I was talking to Thinkwell’s CEO Carl Tyson, he let me in on the secret to their success.While the company does a lot of prep to plan and outline a semester-long course in subjects like calculus, they do not prepare transcripts for their instructors. By working with experts who really know their subject, such as mathematician Edward Burger of Williams College, they’ve found that letting teachers speak extemporaneously creates the most lively, dynamic videos, able to hold kids’ attention for more than three minutes (the usual video viewing time–although they do break up the lessons into 10-minute segments).This is a great lesson for other sites working with experts and video. Don’t be afraid to go a little cin