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Craig Constantine

programmer, system administrator, problem solver; casual mountain-bike cyclist, avid reader, student of aikido and parkour

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  • Pennsylvania, USA
  • constantine.name
  • Member for 6 years, 10 months
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  • Last seen May 19 at 23:24

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35 Can you tack against the sun using a solar sail? Jul 18 '13
11 Is it possible to build a Dyson sphere or its variant in our solar system based on our current technology? Jul 16 '13
11 Is it possible that a giant 10th planet exists in our solar system? Jul 16 '13

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