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communicate something online by recording a sketch, optionally with your voice speaking. Any sketch can then be embedded on your blog/ homepage for people to play-back, and you can also point people to your sketchcast channel here (or let them subscribe to your sketchcast RSS feed). Create a tutorial explaining how boomerangs work (and why they don't always return). Draw a doodle of your ex. Explain a math formula. Create a cartoon (you can use the eraser tool to make place for several panels of the cartoon). Get a partner and explain a concept together... voice recording doesn't have to be used by only one person! Write a love letter with lots of sketching inbetween. Create an online Chinese course and explain Pinyin writing. Create a masterpiece and show others how to draw. Explain baseball to Europeans... or explain soccer to Americans! Create a riddle for kids: draw something and the kid has to guess while you're drawing. Draw a manga action scene. Or many other drawing ideas.