Po (river) 70,000 in Italy, of which 41,000 is in montane environments and 29,000 on the plain. The Po is the longest river in Italy; at its widest point its width is . The Po extends along the 45th parallel north. The river flows through many important Italian cities, including Turin (Torino), Piacenza and Ferrara. It is connected to Milan through a net of channels called "navigli", which Leonardo da Vinci helped design. Near the end of its course, it creates a wide delta (with hundreds of small channels and five main ones, called "Po di Maestra", "Po della Pila", "Po delle
What Is History? 19th century, western historians held to an empirical, positivist worldview that revolved around a "cult of facts", viewing historical facts as information that simply had to be assembled to produce an objective picture of the past that was entirely accurate and independent of any human opinion. Carr argues that this view is inherently flawed, because historians selectively choose which "facts of the past" get to become "historical facts", or information that the historians have decided is important. As an example, he notes that millions of humans have crossed the Rubicon river in Northeastern Italy, but that historians have only chosen