Anyone who has ever had a 9-year-old understands the concept of the unanswerable question. While I've fielded my share from my son Ethan, there is one question he keeps lobbing at me that I can't even make up a good response to.
The hardest thing to quantify is buzz. Webster's defines it as "to be filled with a confused murmur." However you define this word, it was a big part of the third annual EduComm Conference in Orlando this June.