The Next Idea So many innovative ideas begin with inventors observing simple events. Take Newton’s falling apple, for example, or Archimedes’ overflowing bathtub. For Emil U r eel of West Michigan, it was building an ice rink in his backya rd — or rather designing a refrigeration system to keep it from melting. “ I thermodynamically ended up pr oducing a chiller system from a used central air unit,” U reel said. “Going through the process , I learned something related to thermodynamics that’ s