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Are you teaching a special numerical lesson this Friday? 0 will feel jealous of his binary brother this Friday. To help you in your celebration of so many 1s, we're making all our 1 and 11-related math songs free for one day only on 11/11/11! We've got "1" songs for Addition & Subtraction, Multiplication, and Division. Use them this Friday to review the special mathematical properties of 1 and 11. And if you can't wait till then, sign up for your free trial to listen to "1" songs (and many, many others) now.

Revolution, rotation, orbit—the terms could make your head spin. But our new free Solar System video, "Confessions of a Planet," will set your students straight! In this lesson, students will research a planet in the Solar System, and present their findings to the class...in rhyme!

Physics teachers take heed: Halloween is the perfect time to brush up on your Edgar Allan Poe. You may ask, "Aren't they covering that over in the English department?" They may. But with this interdisciplinary mini-lesson, you'll have your students thinking about this gothic tale of terror in a mathematical way. So go ahead...teach physics with "The Pit and the Pendulum." Before you begin, you can watch our video that summarizes "The Pit and the Pendulum" or read the full story here.Then you are ready for two key questions. QUESTION ONE: HOW DEEP IS THE WELL? In the story, the…

Need some scary stories for Halloween? Just flip on the news. An earthquake shook Turkey, police clashed with protesters in Oakland, and the SAT is upping test security by hiring...former FBI agents. But we've got some good news, too. So tune in to the latest Week in Rap. We recap the news this week with some spooky flourishes. And we're asking you... How are you celebrating Halloween? Are you dressing up? Are you teaching a special lesson? Let us know in the comments!