Reference
| Category | Notes | RTool Rating | Popularity | |||
| General | When you need to know where to go to know! |
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| Infoplease | A great site, with a number of highly useful sources to search. |  |
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| Encyclopedia Britannica | The dady of all encylopedias, OK so you need to pay to use it properly, but even the free, cut-down, search is useful. | |
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| Practical | How is the question you will find answered here. |
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| How Stuff Works | An excellent site, clear, precise, and thorough. | |
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