Question: When did Leg 8 of The Amazing Race 21 first air on television?
About the article "The Amazing Race 21", section "Leg 8 (Russia)".

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The Amazing Race 21 is the twenty-first installment of the American reality television show "The Amazing Race" on CBS.
It features eleven teams of two, each with a pre-existing relationship, in a race around the world.
It premiered on September 30, 2012, at 8:00 p.m. ET/PT on CBS and CTV with the two-hour season finale on December 9, 2012.
While the prize for winning the Race remains at , if the team that came in first in the first leg had won the race, the prize would have been doubled to .
"The Fabulous Beekman Boys" stars and husbands Josh Kilmer-Purcell and Brent Ridge were the winners of "The Amazing Race 21". 
A non-elimination leg is when the last team to arrive at the Pit Stop is not eliminated and is allowed to continue on the race.
"The Amazing Race Philippines", along with the French version, were the first versions of the race that did not penalize the last team to arrive in a non-elimination leg since the incorporation of the non-elimination penalties in season 5 of the American Version.
This occurred in the third leg of the first season.
However, in the seventh and eleventh legs, the "Marked for Elimination" penalty was applied to the last team arriving on a non-elimination leg.
Meaning, teams had to arrive first at the next leg or receive a 30-minute time penalty. 
The Amazing Race 13 is the 13th installment of the reality television competition series "The Amazing Race".
It featured 11 teams of two, each with a preexisting relationship, in a race around the world.
The 13th season was part of the fall line-up for 2008-09 season and premiered Sunday nights at 8:00 p.m. ET/PT starting on September 28, 2008 and the season finale aired on December 7, 2008 at 8:00 p.m. ET/PT.
Siblings Nick and Emily "Starr" Spangler were the winners of this race.
Excluding the Family Edition, Starr remains the youngest person ever to win the Amazing Race, at age 21 during the race.
Nick and Starr are also the first team of siblings to win the competition. 
The following teams participated in the Race, with their relationships at the time of filming.
Note that this table is not necessarily reflective of all content broadcast on television due to inclusion or exclusion of some data.
Placements are listed in finishing order:  A team placement means the team was eliminated.
A indicates that the team won a Fast Forward.
If placed next to a leg number, this indicates that the Fast Forward was available for that leg but not used.
A indicates that the team decided to use the first Express Pass on that leg.
A indicates the team had previously been given the second Express Pass and used it on that leg.
An underlined leg number indicates that there was no mandatory rest period at the Pit Stop and all teams were ordered to continue racing.
The first place team was still awarded a prize for that leg.
An team's placement indicates that the team came in last on a non-elimination leg and had to perform a Speed Bump during the next leg of the race.
A or a indicates that the team chose to use one of the two U-Turns in a Double U-Turn; or indicates the team who received it; indicates that the team was U-Turned, but they used the second U-Turn on another team.
Leg 1 featured two Roadblocks and no Detour.
The team member who did not choose the first Roadblock (the racer who paraglided rather than directed the taxi) was required to complete the second one.
Nicole & Travis initially arrived 1st, but were issued a 30-minute penalty for taking a taxi to the Pit Stop when the clue stated that teams had to go on foot.
Tim & Marie checked in during the penalty, dropping Nicole & Travis to 2nd.
Leo & Jamal initially arrived 1st, but could not check in because they did not fully pay their cab fare.
When they returned to the cab to pay their fare, Chester & Ephraim checked in, dropping Leo & Jamal to 2nd.
Chester & Ephraim encountered several air travel delays and did not arrive in Lisbon until many hours after the other teams had already finished the Leg.
While still in Lisbon Airport, Phil met with them to inform them that they were the last team and were eliminated from the race.
Tim & Marie used their Express Pass to bypass the Detour in Leg 5.
Nicole & Travis used the Express Pass given to them by Tim & Marie to bypass the Detour on Leg 8.
Leo & Jamal departed from the Al Ain Pit Stop in last place alongside Ally & Ashley because they overslept and missed their departure time by two minutes.  
In 2010, Smith competed in "The Amazing Race 17" with then-boyfriend Chad Walthrip.
The show premiered on September 26.
Their worst placement was an eighth place finish in Leg 1 and their best was a first place finish in Leg 8.
While on the race, Waltrip surprised Smith when he proposed her to marry him and she accepted.
In Leg 9, they finished in fifth place and were eliminated.