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Recorded Delivery acyclovir 200 mg for cold sores In the latter, for example, Achor cites research showing that SAT scores rise and fall according to the number of test takers in the room. Why? "When we perceive there are fewer competitors, we believe there is greater likelihood of success, which results in more engagement and concentration and improved performance," he says. The same rationale explains why a stadium with better "park factors," such as propitious wind flow or altitude levels, could enable a baseball player to hit so many more home runs than expected. In this example, the baseball player moved to a team whose stadium boasted 28.6 percent better park factors, and yet the player far surpassed the logical advantage, batting 60 percent more home runs.