Our experts weigh in on four of the biggest questions in NASCAR:Turn 1: Should Dale Earnhardt Jr. retire?Ricky Craven, ESPN NASCAR analyst: Dale Jr. is the most qualified person to answer this question and he says no, that he would like to continue competing. What concerns me is the concussion symptoms have persisted, he will be 42 next season and another wreck is inevitable in this business. Unless he has a burning desire to accomplish more than he already has, he should retire. The risk appears to outweigh the reward.Ryan McGee, ESPN.com: No. Not yet. I think the best possible scenario is the one hes taken, which is having a half a year to see what kind of ground he can make up. I think we all know him well enough to know hes not going to go out there if he thinks hes a danger to himself and others. So if he needs to take another year, fine. But right now getting back behind the wheel should rank way further down his priority list than any fan would ever want to admit.?John Oreovicz, ESPN.com: Maybe its his call, maybe its his doctors. Id say yes. In the shadow of his father, one of stock car racings all-time most imposing figures, he has accomplished an awful lot on the track and developed into one of the sports best personalities in his own right. Junior has many avenues open to him to remain involved in NASCAR and, once the shock has worn off, he might find the reduced stress level from not being a driver is to his liking. If hes forced to quit due to medical reasons, he has nothing to be ashamed of and a great platform moving forward to advance awareness of head injuries and the prolonged damage they can cause.Bob Pockrass, ESPN.com: Earnhardt shouldnt race anymore, just like I shouldnt have this third cup of coffee while writing this. It potentially could be bad for his long-term health. But if Earnhardt -- and his fiancée and his car owner -- is willing to take the risk and believes he could mentally handle the consequences if he suffers another concussion from a routine accident, then he should race again.Turn 2: Should Rick Hendrick be working on a plan for a driver for the No. 88 car for 2017? Who should it be if Earnhardt isnt ready by the start of next season?Craven: I would say wait a few months; there is plenty of time. Allow this process with Dale Jr. to take its course and support his efforts. Alex Bowman has done a very nice job and has enough experience to be a solid alternative.McGee: Yes. And it should be Alex Bowman. Or perhaps a Bowman/William Byron mix. Whatever they do, it needs to be someone other than Jeff Gordon.Oreovicz: You can be certain Mr. H has already been working on a Plan B for the 88 for some time now and with William Byron waiting in the wings, it might be a one-year issue. Alex Bowman already has experience with the team and if he performs well in his remaining eight races this year, he probably has the inside track. As a short-term stopgap, Id also take a look at Sam Hornish Jr.;?after his part-time success the last couple years in the Xfinity Series, it would be interesting to see how he would do given another shot at the Cup Series in a quality ride.Pockrass: Yes. There is no timetable for Earnhardts recovery. Hendrick should hire Greg Biffle. Biffles last year of his Roush Fenway deal is 2017, and Biffle leaving Roush Fenway allows the team to save on salary and for Chris Buescher to move into a full-fledged Roush ride. Hendrick gets a veteran for one year who could handle a situation if Earnhardt returns during 2017.Turn 3: Should NASCAR have taken the truck win away from John Hunter Nemechek for rough driving?Craven: Probably not. I believe this will play out among the fraternity of drivers. Let it be a driver-code issue. It did happen to Ricky Rudd many years ago at Sonoma, after spinning Davey Allison on the final turn, but it left a bad taste.McGee: Not just no, hail no. This was the Truck Series-level version of the 79 Daytona 500. They led SportsCenter! They won the Internet! The Trucks! They should send him and Cole Custer a gift basket.Oreovicz: NASCAR has always subscribed to the philosophy that the winner is who the fans saw cross the line first. But theres reason here to believe NASCAR could (or should) be rather heavy-handed in postrace sanctions because Nemecheks driving on the last lap clearly deserves to be penalized. Id suspend him for the first race of the Truck Series Chase, a genuine penalty that would make his path to a championship more difficult.Pockrass: No. The first bump was fine but the length of the shove of the second one was dirty. And then Nemechek lost control, resulting in the body slam that sent them to the wall. Nemechek could have lifted as they came to the checkered since it was his fault, but its also hard to fault someone going for the win. Nemechek will have to live with the consequences (payback). But Nemechek gets the benefit of the doubt that he tried to only bump-bump-and-run and not intentionally crash Custer -- therefore, no penalty.Turn 4: Did Kevin Harvick go overboard with postrace comments about his pit crew?Craven: Its not a healthy practice, but Kevin Harvick is among the few capable of pulling it off. The risk would be that team members lose confidence in their leader for humiliating them publicly. The flip side is, Kevin is among the best drivers in the business, he carries much authority at Stewart-Haas and can force change. Kevin will continue to be fast and consistent. His pit crew needs to be the same to win another title.McGee: Nope. He wasnt wrong. And hes taken this tack before at both Stewart-Haas and RCR to a pretty positive result. This is no different than a quarterback chewing everyones butts in the huddle on Monday Night Football or a coach questioning a guys play during a press conference. You cant do it all the time because then you become Chicken Little and you lose the impact. But when you do speak up, it creates action.?Oreovicz: No. Despite changes over the past couple of years, the No. 4 team regularly has more problems in the pits than any other crew. By his own standards, Harvick has been pretty diplomatic with his frustration to this point. But when he watches the Gibbs and Penske teams -- not to mention the other crews within Stewart-Haas Racing -- consistently execute flawless stops, hes got to be doing his best Jeremy Clarkson impression of saying, How hard can it be?Pockrass: Sure he did. But Harvick has been that way for years. You dont go play basketball for Bob Knight and then get mad that he yells at you. 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SAO PAULO -- It might be time to put Neymars name back on the Brazilian jersey.After an uninspired start that prompted some fans to replace his name with Martas on the famed No. 10 shirt, Neymar is finally showing why he arrived at the Olympics as one of its biggest stars.Neymar led Brazil to the semifinals of the Olympic soccer tournament with an outstanding performance in the 2-0 win over Colombia on Saturday. He scored a goal and was one of the best players on the field, constantly creating opportunities despite being harassed by Colombian players nearly every time he touched the ball.He took a beating but he still helped the team a lot, Brazil striker Gabriel Jesus said. Everybody knows he is a star. He is crucial for us.Neymar impressed with his talent and his toughness, the type of performance that Brazilian fans had been expecting since the beginning of the Olympics.Neymar gave a very positive response, Brazil Olympic coach Rogerio Micale said. He was provoked almost the entire first half but he didnt let that get to him. He behaved well as the teams captain.The Barcelona player lost his cool once before halftime, committing a hard foul on a Colombian player with a tackle that led to a bench-clearing brawl. The play ignited fans at the Arena Corinthians, but he left himself in danger of being sent off.It was the only thing. He came in harder, just like they were doing, and received the yellow card, Micale said. After that, he kept his calm.Despite being the tournaments top player, Neymar had disappointed in the first two games with Brazil, when the title-favorites were held to scoreless draws by South Africa and Iraq. He was being loudly criticized by fans and local media, who said he lacked leadership and wasnt worth being Brazils captain.dddddddddddd.A photo of a Brazil jersey with Neymars name scratched off and replaced with Martas name went viral, and supporters heckled him by chanting the womens stars name during games.With the team in danger of another embarrassing home elimination two years after the demoralizing 7-1 loss to Germany at the World Cup, Neymar finally took over in the must-win game against Denmark, setting up two goals in the 4-0 victory.On Saturday, he kept alive Brazils hopes of winning the soccer gold for the first time by scoring from a free kick in the 12th minute. He controlled the pace for Brazil throughout the match despite being provoked by Colombian players.Neymar is very experienced, he helped us a lot, said Luan, who scored the other goal against Colombia in the quarterfinals. He controlled the game and overcame the pressure. He was crucial in our victory.Neymar is only 24 but is one of the teams most experienced players. He skipped the Copa America earlier this year so he could play in the Olympics to try to give Brazil the unprecedented gold, which is the only significant trophy Brazil hasnt won in soccer. Neymar was in the team that lost the 2012 Olympic final to Mexico in London.Brazil will play Honduras in Wednesdays semifinals at the Maracana Stadium, which will be the teams first game in Rio de Janeiro. Germany and Nigeria play the other semifinal match in Sao Paulo.---Tales Azzoni on Twitter: http://twitter.com/tazzoni . His work can be found at http://bigstory.ap.org/content/tales-azzoni ' ' '