Trying to convince shoddie.

Blog entry posted by JEFF CT, Nov 21, 2013.

Hey. One argument that I hear from shoe-wearers (im not 100% bf yet) is that modern man-made concrete and asphalt are too hard and we did not evolve to handle it.

I recently read a rebuttal that packed desert sands that Geronimo crossed, and solid rock were as if not more dense than modern pathways. I was looking for hard data, and here is what I compiled. I think it makes the case for several materials being similar in density.

Concrete, Asphalt 2243
Concrete, Gravel 2403


Rubber, manufactured 1522

Earth, dense 2002
Gravel, wet 1/4 to 2 inch 2002
Limestone, solid 2611
Quartz, solid 2643
Sand, wet 1922
Sand, wet, packed 2082
Sand, dry 1602
http://www.simetric.co.uk/si_materials.htm