In a series of experiments that could have been plucked from the pages of science fiction, researchers at Stanford University massaged a solution containing tartrazine, the chemical found in the food dye known as "yellow No. 5," onto the stomachs, scalps and hind legs of mice. About five minutes later, the opaque skin of the mice transformed temporarily into a living window, revealing branching blood vessels, muscle fibers and contractions of the gut.
You could see through the mouse. I've been working in optics for 30 years, and I thought that result was jaw-dropping,
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