TV networks and sports leagues rely heavily on Nielsen to to tell them how many people at home watch football games, tennis matches and auto races. Counting viewers in bars, hotels and offices? That has sometimes created a bone of contention. The measurement giant says it will use NBC’s telecast of Super Bowl LX on February 8 to kick off use of a new methodology — arming Nielsen panelists with wearable devices that capture audio from content being watched — that it believes will more accurately