People who think more about whether they are right have more cells in an area of the brain known as the frontal lobes.
UK scientists, writing in Science, looked at how brain size varied depending on how much people thought about decisions.
But a nationwide survey recently found that some people think too much about life.
In years of building and looking at dragster models, something that has generally detracted from the majority of them has been their front wheels. In recent years, the aftermarket has begun manufacturing photo-etched wire wheel kits. While these are a vast improvement over the bulky-spoked kit pieces, photo-etched spokes are flat. Obviously, real wire wheels have round spokes.