Connecticut killer was 'intelligent, nerdy' son of teacher

It remains unclear why Adam Lanza (20), who had no criminal history and whose family remember as nerdy and remote, gunned down two dozen people.

The fall of Richard Nixon

The scandal began with a botched burglary that initially attracted little attention but ended two years later with the first and only resignation of a president. To many Americans, Watergate is a dimming memory, if that. A majority of living Americans were not yet born or were children when President Richard Nixon was forced from office in 1974.