You gotta have thick skin to survive in this crazy world—but that skin has to be sensitive, too. Robots and prosthetic limbs have the first part solved, with shells of titanium and carbon fiber. But the second part? No artificial coating can compare to real skin. 1 Chemist Zhenan Ban aims to fix that problem. She's working on "pressure pixels" made of stretchable, microscale organic field-effect transistors—building 40 years of advances in silicon chip design and nanof abrication into a flexible sheet. Last year, her team at Stanford University sandwiched
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