If you've got two OLPC XO laptops you can measure the distance between them usin... | Hacker News

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ZeroGravitas on Sept 3, 2009 | parent | context | favorite | on: School kids measure distance to the Moon

If you've got two OLPC XO laptops you can measure the distance between them using a similar techique:

http://wiki.laptop.org/go/Acoustic_Tape_Measure

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