Take The Senses Challenge. A nicely-done 20-question quiz about human senses, from BBC. Permalink Created Fri, 25 Jul 2003 ### [The J-Walk Blog] 
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Introduction to the Theory of Relativity Part III: General Relativity. This is the third of a series of elementary, informal, and mostly equation-free articles descibing the Theory of Relativity in physics. The series will have four installments: Part I: History This described the history of ideas in the development of relativity. Part II: Special Relativity This described Einstein's Special Theory of Relativity. Part III: General Relativity This gives at least a taste of Einstein's General Theory of Relativity, which extends the Special Theory to cases involving acceleration and gravity. Part IV: Implications, Controversies, and Miscellany This will address implications of the Theory of Relativity, controversies both old and modern, experimental evidence, and anything else that isn't covered in the first three installments. This installment gives a taste of Einstein's General Theory of Relativity. It does not assume much knowledge about physics, but it does assume familiarity with the ideas developed in Part I and especially Part II. [kuro5hin.org] 
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