Electricity is nothing like gas. You can't just pump a tank full of it into your electric car, which means that we're reduced to lengthy charge times or inefficient compromises like battery swap stations. MIT researchers may have come close to solving this problem with a battery goo that you can pump just like gas.
Radioactivity is nasty stuff, and when you've got radioactive surfaces all over the place, trying to clean them up often just results in your cleaning supplies becoming radioactive as well. This blue goo neatly takes care of the whole problem, capturing radioactive particles and storing them while simultaneously cleaning better than a scrub brush.