Excellent point Wally.


Day, Wally wrote:
>> The concrete
>> sidewalks, tile floors, etc are substantially harder than what the
>> average paleo was walking on or even the average person a few hundred
>> years ago.
>>     
>
> I don't know about that... During the winter around here the frozen ground feels harder to me than asphalt, and easily as hard as concrete. :)
>   


-- 
PK