I spent last weekend at the Bristol Motor Speedway watching the NASCAR Sprint Cup Series Irwin Tools Night Race.
If you know anything about NASCAR — or any kind of racing, really — you probably know what “drafting” is.
(For those of you who don’t, drafting is when one car follows closely behind another car for aerodynamic purposes. For example, it helps block wind resistance, which brings other benefits.)
For a little while, drafting can be extremely beneficial in racing. Obviously, the drivings don’t want to draft the entire race — if they do, they’ll never make it to the front and have a shot at winning — but for a little while, it works.
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