I've sung the praises of this piece of machinery before, the PolyScience smoking gun. Feta, Radishes, Butter are just a few of the things we've used it for - not to mention it's daily use for our signature radish appetizer.
Wylie Dufresne of WD-50 shows Adam Frucci of Gizmodo how he and his pastry chef use liquid nitrogen to create ice cream balls perfectly encased in chocolate cookie crumbs. Mmmm, delicious!