What is the time between two football world cups?

Was mingo Daniel Boone's friend in real life? What is the iron horse that was made during the industrial revolution? How many books has adeline Yen Mah written? What is the alphabet that police use? What is meant by the gilded age in the late 19th century? How tall were the twin towers in feet? What were two important changes that Peter Stuyvesant made to New Amsterdam? How does this passage contribute to the overall purpose of the speech? What was the intended goal of the cotton gin in regards to slavery? How did the Holocaust cause 911? Is supercuts open on 4th of July? What does the surname Hudgins mean? What brought an end to the regulator movement? What part of Ireland does derek landy live? What language did the Romans bring into Britain? How has the size of the Native American population changed before and after colonization? What are the stops on the transcontinental railroad? Is there an organization for descendants of immigrants to the US 1600s like the DAR? How is my grandson related to my cousin's grandson? Which command relationship is established by a superior commander between subordinate commands when one organization is needed to aid protect complement or sustain another?