A suggestion to make a mallet from lead opens a warning about material choice in enclosed habitats. Lead can poison occupants, especially if working it releases fumes into the air system. Asbestos provides the naval comparison: a material that appears stable can become dangerous when survey or repair work disturbs it. A personal example involving asbestos inspection aboard ships reinforces the long-term health and maintenance cost. Colony designers must judge feedstock by toxicity and repair conditions as well as mass and ease of manufacture.
Notable Point · 2:04:45-2:05:49
Lead, asbestos, and enclosed-habitat safety
A lead-mallet suggestion leads to a warning about toxic materials, asbestos exposure aboard ships, and the extra danger of fumes in a closed habitat.