They gave us the written word where before stories were word of mouth. Even though they wrote in Latin many of the root words are used today in the English language. The gave us measurements like mile, foot and inche. Also Roman numerals are still used, especially in regards to time-pieces. They gave us Christianity. They also introduced some spices and small animals like poultry.
Kashmir is the main reason. (Now Bangladesh)
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I Think It should be 10. Cause If Something Is Not 5 or higher it can't be Rounded to the next number. since 3 is a low number it'd be 0 which means it would probably stay as 10