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HopDavid
  • Member for 10 years, 9 months
  • Last seen more than 5 years ago
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I love art and math -- M.C. Escher is an influence. I enjoy science fiction. I'm interested in space exploration.

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Photo stretched at corners?
Mar 17, 2014
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53
How fast will 1g get you there?
41
Why don't we launch spacecraft from the Moon?
26
What's the path of something dropped from a space elevator
25
Can a natural satellite exist in a geostationary orbit?
24
What's the path of something dropped from a space elevator