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*From*: John Denker <jsd@AV8N.COM>*Date*: Thu, 12 Aug 2004 07:03:16 -0400

Since phys-l has been somewhat listless lately, here

is a riddle:

Dr. Livingstone starts out at a place which we call

Point A. He then undertakes a journey consisting

of three legs:

-- he travels precisely southward for one mile;

-- then he turns and travels precisely eastward

for one mile;

-- then he turns and travels precisely northward

for one mile.

He discovers that as a result of this journey, he

has returned to Point A.

Note: He travels by airship, at an appropriate constant

altitude, so you don't need to worry about obstructions

or other nonidealities.

The questions are:

1) Where is Point A?

2) Are you sure? How do you know?

===========

Usual ground-rules: The right answer depends on

understanding the physics of the situation. This may

require some outside-the-box thinking. Everything

I've said is intended to be true and helpful. I expect

a strong consensus as to the correctness of the answer.

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