"I know my tolerances are mostly beyond my ability or inclination to find," she says. "Cold weather is uncomfortable but I didn't manage to give myself frostbite the one time I tried. I don't need oven mitts. I don't get chemical burns. I have yet to meet the impact that can so much as bruise me, and I am impermeable to sharp objects including needles, knives, and any power tool you can name. Which was very exciting to test, let me tell you. I also don't get sick, although I haven't deliberately tested my resistance to infection in any systematic way."