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Altitude  

Higher altitudes affect people in an unpredictable way -- sometimes a person is not affected by
high altitudes and another time they might be strongly affected.  We try to take several days to
relax and adapt ourselves to high altitude.  I'm not sure this works, but it seems to.  In some cases
I have been unable to walk a hundred yards at 6,000 feet and at other times do hikes at 9,000
feet.  Usually a person becomes acclimated in a few days, if in doubt go to a lower altitude or seek
medical attention.  

As a rule of thumb:  temperature drops 3 degrees F as altitude increases a thousand feet.

When at high altitudes it is necessary to consume plenty of water and use sunscreen protection.  
Travel Letters