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Oort Cloud Parabolic Comet | Classical Mechanics | 316 |

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How Do I Turn Around? | Classical Mechanics | 422 |

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Incorrect Hotel Payments | Logic | 230 |

Radical System | Algebra | 229 |

Too many celebrations going around | Algebra | 196 |

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Michael Mendrin's Messageboard | 424 | |

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Updating Archimedes' Method of Approximating π | 273 |

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