Scientist's new rewriteable 'paper' is actually made of glass or plastic

Scientist's new rewriteable 'paper' is actually made of glass or plastic:

If you ask us, the idea of rewritable paper seems pretty redundant no matter how high-tech it is. Apparently that didn't cross the mind of scientists at the University of California, Riverside. See, that's where Yadong Yin and his colleagues are usin...