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From: The Starmaker <starmaker@ix.netcom.com>
Newsgroups: sci.physics.relativity
Subject: Riding my bike..
Date: Fri, 01 Jun 2018 15:15:03 -0700
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Xref: csiph.com sci.physics.relativity:460038

now, if i'm riding my bike and
a person is riding theirs across
the street..
of of us 
doesn't seem to be moving.

howdayou measure who is not moving?