The whole world should switch to the metric system.

But, your explanation still lack of the trouble and complexity of switching standards of units. The main purpose of units of standards increase convenience of lives of people. Of course I admit globalization is the main trend in the modern age so unified units based on scientifically logics are much useful. But, in the general use, we should also consider customs of people that are not easily changed. No matter how you point out illogical people, it is the real situation where overwhelming changing customs often provoke failure in the history. In addition, if you mainly get USA television shows, you should understand USA's own culture and standards. If you mainly get a minority races TV and complain why the minority races use their own language that are illogical and hard to use, not to change English or other major language in the world that are logical and easy to use on the TV program, do you think it is logical? Both units and languages is the rule of conversation between people and people that have the purpose of increasing convenience of the users. Already, most country in the world already use metric system, so if USA still remain only non-metric system in the world, it is not provoke much complexity to the outer world of USA. If USA people still think the complexity is not accepted of changing their standards from imperial system, they have the right to remain their standards. Even so, this situation have no specific harms. Only the trouble of translation exist like the situation of the language. Do you really think it is not a really acceptable situation? Don't you think globalization also mean to respect difference of others? Do you really think imperial system of USA set back their scientific progress? Also, the use of two systems of measurements can be an obstacle in the science of USA, but still, how can you explain the level of USA science is most developed in the world? Can you really prove Imperial system so much harm in the USA science not only show me examples of accidents but also other things? And, if you particularly wish I show you examples of the level of USA science, it is useless. I can so much easily find my examples like the number of the Novel Prize Winner in the science parts. In addition, you only told me the possibility of setting back the science, but had no practical proof the imperial system set back USA science yet. But I can tell you the side effects of changing standards like the cost of changing USA science textbooks, complexity of scientists and students who want to be the scientists who already learned by using old-type science textbooks who already skilled to use two systems of measurements, and so many other things that can set back of the level of USA science. Don't you really think you omit this side effects of changing standards? I admit SI system have much logical system and easy to calculate so it can be easily used. But 'meter - is the distance that light travels in a vacum in 1/299,792,458 of a second.'. Do you think we can easily use this standards in the daily lives? We can only use rulers that have also errors like feet. In addition, 'Kilogram- is equal to the mass of the International Prototype Kilogram, it is also almost exactly equal to one liter of water.', 'Celsius- Temperature scale whereby 0 degrees is the freezing point of water and 100 degrees is the boiling point of water.', Do you really think only gaining a little more accurate, but provoking trouble of the lives of the USA people is 'logical and scientific' plan? Do you really think 'Fahrenheit' and 'Pound' have really serious errors so USA people already complain every day their complexity of units? In addition, you told me 'the metric system has the distinct advantage of having all its units multiples of 10.' and 'The Imperial system of measurements is so messed up and needlessly confusing.'. But you found your examples so much far away. You can also easily find other examples in your near place of units that are not used to multiples of 10 - the system of time. 60 seconds, 60 minutes, 24 hours, 7 days, 28 days, 29 days, 30 days, 31 days, 365 days and 12 months are also so much complexity. But I don't think you have the special trouble because of the system of time because you did not tell me first, you already skilled to use this system second, it is widely used in the world third, and finally multiples of non-ten also have useful aspects to people. If you want to have no contradictions with this topic in the situation, you can only choose that ways. 1. You can choose this arguments that the system of time is also based on the multiple of 10. 2. You can choose this arguments the changing of time and the changing of the USA standards of units is the different matters. But in this case, you should explain why USA people should accept their trouble by changing their standards of units but outer people have no reason to change their illogical standards of units. I'll wait your reply. I have more examples like carot, barrel and so many other things that can be contained this debate.