21.   The casual viewers know Lewis for his championship arrogance, his Houdini-like ability to overcome athletic old age and new opponents and team regulations.

22.   The casual viewer knows that pro football is no longer a team sport, but a highlight film auditioning new dance steps and new free-agent contracts.

23.   The devil is in the details, and viewers always know when something is askew.

24.   The line lets the viewer know where the offense needs to go to reach a first down.

25.   The NHL is an embarrassment on television for all the reasons that viewers have known for years.

26.   The networks leave no stone unturned in telling the life stories of the victims, straining to create the illusion that the viewers knew them personally.

27.   The result, plainly, is a confusing mess, and the overall content assumes the viewer already knows a great deal about space history.

28.   The viewer knows that.

29.   The viewers know this.

30.   They have mixed feelings about how much viewers should know in advance.