The width of the space shuttle is determined by the horse's ass.

The standard distance between the two railway tracks of modern railway is 4.85 feet, about 1.435 meters, but a considerable number of people do not know, why should we adopt this standard? Originally, the early railway was designed by the people who made the tram, and 4 feet and 8.5 inch were the standard used by the tram.

So where does the tram standard come from?

The first person to create a tram used to create a carriage. Therefore, the standard of the tram follows the wheel distance standard of the carriage. So why should the carriage-drawn carriage use such a wheel distance standard?

The width of the British road track is 4 feet and 8.5 inch, so if the horse uses another wheel distance, its wheels will soon break down on the old British road. So where did this result from?

From the ancient Romans. Because the long-distance roads in Europe, including the UK, are laid by the Roman for his army, and 4 feet and 8.5 inch are the width of the Roman chariot. If any other wheel car is on these roads, the life of the wheel will not be long.

I can ask again: Why is the Roman's cycle of a chariot of 4 feet and 8.5 inch? The reason is simple. This is the width of the two horse butlers that index a chariot.

The story is not over yet. There are two rocket booster on both sides of the U. S. Space Shuttle fuel tank, because these booster will be transported by train after they are created, and some tunnels will be used on the road, and the width of these tunnels is only a little wider than the train rails. Therefore, the width of the rocket booster is determined by the width of the rails.

Therefore, the final conclusion is: "path dependence" leads to the width of the U.S. space shuttle rocket booster, which is determined by the width of the two horse's buttocks two thousand years ago.

Once people make some judgment, it is like taking a road of no return. The force of inertia will make this choice constantly strengthen and make it easy for you to leave, this phenomenon is called "path dependency ".

Bill Gates said: what we are looking for is a path-dependent opportunity-that is, the opportunity to benefit the vast majority of consumers by adopting consistent standards. Windows's high market penetration rate has reduced the cost of selecting an operating system and won a stable monopoly for Microsoft.