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  1. #1
    Accidental Vintage Rider pohlf's Avatar
    Join Date
    Apr 2007
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    San Francisco
    My Bikes
    '67 Schwinn Varsity, late 70's(?) (Mike) Melton
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    Some birds "see" the earth's magnetic field..

    I thought this was pretty interesting. Think of the grams they save by tossing their compasses on cross-country flights.

    http://blogs.discovermagazine.com/no...sion-is-sharp/

    Gleaned from DKOS weekly science article roundup.
    Last edited by pohlf; 07-10-10 at 09:21 AM. Reason: tie-poh

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