The "Cement" mentioned above is a little inaccurate. He developed a type of cement that was nearly indestructable. The buildings around the labs in West Orange, NJ were constructed of this material. After the labs closed, a number of the surrounding buildings were slated to be demolished. A wrecking ball was brought in, and it actually bouned off of the buildings. They ended up using dynamite. There are some housing developments still standing in Northern New Jersey that were made of this same cement. The houses look nice enough, but it's nearly impossible to do any alterations. Even the interior walls are made of Edison cement, making it nearly impossible to hang picures on the walls or do any exterior renovations.