Though data from all modern missions is digitized and properly archived, the same can't be said for missions prior to 1990.

First and foremost, the substrate must be clean and dry. It must be free of oil, grease, parting compounds, dust, dirt, grit, chemical contaminants, sealing and curing agents, paint, drywall ...

The substrate can also harbor organic materials, such as dirt, dust, drywall paper or organic material residue in particulate form, that may have been lying there for years. You can never get all ...

This becomes a problem with puppies trained to go potty indoors on paper and then required to go potty in the yard on grass, dirt or gravel. "Humans experience substrate preference too. Our ...

This surface may vary greatly from one place to another (grass, gravel, dirt, dry leaves, sand ... Dogs tend to develop a substrate preference when they are young puppies and love sticking to it!