Poll question: True or false: The Earth's seasons are caused by the fact that the Earth's orbit is elliptical. The Earth is further away from the Sun in winter, and closer to the Sun in summer. This poll will close in 2 days. In answering the poll, please do not look at other people's answers before responding, since that will bias the results. Also, please do not post comments on the answer in this thread until after the poll has closed. A number of Harvard graduands were recently asked the same question, and I'd like to compare how members of sciforums go with it compared to these "elite" students.