This revelation came about when one Leon Bellan, a graduate student, was listening to a lecture in Cornell's Nanobiotechnology Center and the not-at-all-creepy thought came to him that cotton candy must look a lot like human veins under a microscope. (He had previously observed that nanofibers also look remarkably like Cheez Whiz, so apparently we have the perpetually hungry and penniless state of most students to thank for scientific breakthroughs.)
The microscopic size of human capillaries is both the key to and the major challenge of creating working organs from scratch. You can make as many fake spleens as you want, but if their cells aren't properly irrigated with blood, they won't be able to ... uh, spleen things out properly. Bellan's solution: Place some glittery sugar fluff in an organ-shaped mold, fill it with a special polymer, and then soak it in hot water and alcohol for several days to let the candy melt away. The result? The "organ" was now filled with an almost completely natural-looking network of microscopic channels.
Leon Bellan et al., via Soft Matter
Just remember to remove all the candy to prevent diabetes. Leave the alcohol.
To confirm that the new capillaries worked, Bellan pumped them with some fluorescent rat blood he presumably had laying around (you don't ask too many questions about the guy that sees human veins in carnival snacks) and just watched it flow. We still have to figure out how to hook up this artificial vascular network to a living host body, which isn't as easy as buying some knockoff Chinese adapter on eBay. However, this isn't the only recent advancement in the growing field of cotton candy-related nanobiotechnology: Scientists at Harvard have created a new method of manufacturing nanofibers that's based on cotton candy machines. And, yes, among the many possible applications are artificial organs and tissue regeneration.
Kit Parker, Disease Biophysics Group at the Harvard School of Engineering and Applied Sciences
"Let me get two cherry-flavored, one green apple, and a pancreas."