Question: Daniel Lee Dierdorf (born June 29, 1949) is a former American football offensive lineman and current sportscaster. A native of Canton, Ohio, Dierdorf played college football for the University of Michigan from 1968 to 1970 and was selected as a consensus first-team All-American in 1970 and a first-team All-Big Ten Conference player in 1969 and 1970. He was inducted into the University of Michigan Athletic Hall of Honor in 1996 and the College Football Hall of Fame in 2000. Dierdorf played professional football in National Football League (NFL) with the St. Louis Cardinals for 13 seasons from 1971 to 1983.

On September 9, 1979, Dierforf sustained torn ligaments in his left knee during an extra point attempt in the second quarter of the second game of the season against the New York Giants. After the game, Dierdorf said, "The knee was completely out of the socket. It moved a couple of inches off to the side. My leg was all twisted around and my foot was pointing in the wrong direction. It was painful. Very painful." Dierdorf was carried off the field on a stretcher, underwent knee surgery, and missed the remainder of the 1979 season.  Dierdorf returned to the Cardinals in 1980, starting all 16 games for the team at right tackle in both the 1980 and 1981 seasons. In 1980, he was selected to play in the Pro Bowl and was selected as a first-team All-NFL player by the NEA. In 1982, Dierdorf moved to center and was the starter at that position for all nine games in a strike-shortened season.  In 1983, Dierdorf returned to his right tackle position and appeared in seven games, only four as a starter. On October 11, 1983, after the Cardinals began the season with a 1-5 record, Dierdorf announced that he would retire at the end of the 1983 season. At the press conference announcing his retirement, Dierdorf said, "This was an easy decision for me to make. . . . Physically, I just can't play the type of game I want to." He added: "Ninety-five percent of me is sad that I'm retiring, but my knees are very, very happy."

Using a quote from the above article, answer the following question: did he set any records?
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Answer: 


Question: Christopher Duan Johnson (born September 23, 1985) is an American football running back who is currently a free agent. Born in Orlando, Florida, Johnson emerged as a senior for East Carolina University where he broke out for 2,960 all-purpose yards and 24 touchdowns. He was drafted by the Tennessee Titans in the first round of the 2008 NFL Draft, after running a then-record breaking 4.24 seconds in the 40-yard dash at the NFL Combine. In 2009, he won the NFL rushing title with 2,006 yards (the sixth of only seven players ever to gain over 2,000 in a season), and broke Marshall Faulk's record of total yards from scrimmage with 2,509.

Johnson had his professional debut with the Titans on September 7, 2008 where he played in the season opener against the Jacksonville Jaguars, which the Titans won 17-10. Johnson rushed for 93 yards on 15 carries and had 3 receptions for 34 yards and a touchdown. In only his second career game, Johnson ran for 109 yards on 19 carries, including a 51-yard run, and 2 receptions for 12 yards against the Cincinnati Bengals.  On September 28, Johnson rushed for the first touchdown of his career against the Minnesota Vikings. Johnson finished the game with 75 all-purpose yards (61 rushing, 14 receiving) and 2 touchdowns. In only his sixth professional game, he rushed for 168 yards and a touchdown on only 18 carries against the Kansas City Chiefs on October 19, 2008. Johnson finished the season with 1,228 yards on 251 carries for a 4.9 ypc and 43 receptions for 260 yards and 10 total touchdowns in 15 games. He led all rookies in rushing yards per game with 81.9 ypg.  Johnson finished second in AP Rookie of the Year voting to Matt Ryan and was elected to the 2009 Pro Bowl.  Johnson split carries with running back LenDale White for the duration of the 2008 season. White finished the 2008 season with 773 yards on 200 carries for a 3.9 ypc and 15 rushing touchdowns. They nicknamed this RB tandem "Smash and Dash." Smash referred to White due to his power, and Dash referred to Johnson due to his unusual quickness and speed. Entering into the 2009 season, however, Johnson dismissed the nickname of "Smash and Dash" and named himself "Every Coach's Dream."

Using a quote from the above article, answer the following question: What did Chris Johnson specialize in?
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Answer:
Dash referred to Johnson due to his unusual quickness and speed.