How come nobody's ever made a deep fryer using gallium instead of oil? It's liquid at cooking temperatures (but stays liquid for thousands of degrees), appears to be non-toxic, and doesn't look like it reacts with food or wooden spoons. (It does seem to be highly reactive with certain metals, though, so the cooking chamber would need to be carefully designed, possibly enameled)
It would be an interesting cooking medium. You'd want to avoid food that would really trap it in little pockets, but think of the benefits: no oils would seep into the food, it would have terrific thermal rebound, you'd get nice even browning. Further, handling it would be great -- because it stands such high temperatures you could toss it in a self-cleaning over and burn out any leftover food at 500 degrees. Plus, unlike many other things in the kitchen, it would be obvious whether it's too hot to touch or not: if it's hot, it's liquid, if it's cold, it's solid.
Ok, it would probably poison a whole lot of people. But there are always technical details to be worked out. Come on, people, we can do this!