Online video lecture about Fibonacci numbers and their link to plants. This is part 1 of 3 total parts. This first video is an introduction to spirals (there are three types)a nd wher eyou find each in nature. The narrator shows you how to draw spirals, then links this to the Fibonacci series. The comments and questions below the video on the site are useful for follow up and to generate class discussion (or quiz questions!). Note: The narrator speaks fast, and does not pause. Repeating and/or discussing the video between this and the next part may be necessary for some students. www.khanacademy.org. NOTE: All Khan Academy content is available for free at www.khanacademy.org