How has the discovery of 5,300-year-old Ötzi, the Iceman, helped scientists in their knowledge?

Ötzi, the Iceman has helped scientists in many ways. By looking at his bones they were able to figure out that he a traveler, a traveler whom had traveled many miles based of the conditions of his legs. They were also able to go through his stomach to see what he had last eaten, but I don't exactly remember what they had found. Finally, they were able to use the arrow that killed him to see what kinds of weapons people of that time used.