Which player set the single-season record for touchdowns with 31 in 2006?

Which running back became the first to rush for 2,000 yards in a season, in 1973? Which player holds the official NFL record for career sacks, with 200? Which running back rushed for 2,097 yards in 2012, just after recovering from a torn ACL? Which running back rushed for 2,053 yards in 1997 and retired suddenly in 1999? Which receiver set the single-season record with 23 touchdown catches in 2007? Which receiver set the single-season receiving yards record in 2012 with 1,964 yards? Which defensive player was nicknamed "Mean Joe"? Which running back was nicknamed "Sweetness"?