What are things that were/are taught in other countries, that American school systems adopted?

There are many differences between schools all around the world. In America we are graded on a scale from 1-100, but in mexico they are graded on a scale from 1-10. There are some all boys or all girls schools in america but in iran boys and girls go to separate schools. Giving a the thumbs up means that the student is doing pretty good in many countries (U. S., Australia, Russia, Finland, Egypt, and Israel); however, the same response in Bangladesh, Iran, or Thailand might mean a trip to the principal's office. While students in America do have a lot of homework per week (about 6 hours), school children in Russia have the most homework per week (nearly 10 hours) and also the highest literacy rate in the world. There are a lot of differences between schools all around the world, but that's what makes them all unique.