T oday, Super Bowl commercials are big business, and considered as important a part of the big game as the half-time show: ...

AD then applies shaving cream to his forehead between his eyebrows, picks up a razor, and says, "Here we go." However, just as he starts, the phone filming him drops, blocking the view.

Place a small mound of shaving cream on a paper towel. Look at the shaving cream. Would you call it a solid, liquid, or a gas? Why? One characteristic of a solid is that it keeps its shape without ...