Cool Videos Add comments Share MIT K-12 Project Links How can you experimentally demonstrate that the Earth rotates? What causes water droplets to bounce when they hit a surface? Ted Talks How to develop a positive outlook and a happiness attitude? What does the rising drop-out rates, schools' dwindling stake in the arts, and ADHD have in common? Leave a Reply Cancel reply Name (required) E-mail (required) URI Your Comment You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> Notify me of followup comments via e-mail. You can also subscribe without commenting. Notify me of follow-up comments by email. Notify me of new posts by email.