www.brainpop.com Brainpop offers short videos on a variety of topics. At the end of each video there are activities and quizzes that can be used as assessments.
www.ck12.org ck12 is a math and science site that offers lesson plans, videos, quizzes, interactives, images, and audios. Just type what you want in the search engine for quick access or sign up to create lessons students can complete in the classroom or at home.
www.sciencebuddies.org Great for teachers, students, and parents to find and create science projects. Take a survey in 5 minutes and find the right project for students.