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http://live.pirillo. com/ - It may not be as cool as going outside and using your telescope to view the night sky, but Stellarium allows you to view the night sky (and more) from the comfort of your computer screen!
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Angles have their origin in astronomy and spherical trigonometry. Here we introduce the rational alternative, called spread, and give examples from ISO paper sizes to the faces of a dodecahedron.
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http://geeks.pirillo .com - http://live.pirillo. com - You ever wonder what would happen if two planets got too close to each other? Or what if one of the planets in our solar system decided to spin out of control towards earth? Well now you can! Bwana did a review of Universe Sandbox for us, and loved it. http://chris.pirillo .com