One thing that engineers and the engineering mindset create is new technology — useful objects that solve problems. Animals living in the wild do not create novel technology of any complexity— it is a distinctly human trait that comes from our ability to identify problems and then invent solutions for them. The development of technology is something that happens early in many human cultures. We get a glimpse of the technology available about five thousand years ago because of a man today known as Otzi, who died in 3300 BCE but was preserved almost perfectly in mummy form in a glacier and discovered in 1991. On his person, Otzi was carrying many pieces of technology of his era. He wore, for example, grass-insulated shoes with bearskin soles and deerskin uppers. He also had clothing (hat, coat, pants, belt) made of animal skins. Thread made of sinew held the skins together. His tools are even more surprising. The most impressive is a copper axe with a yew handle. He was also found with a dagger with a flint blade, wooden handle, and a sheath attached to his belt. He carried a bow, although it seems it was not yet finished and did not have a string. To go with the bow he had a quiver with arrows and arrow shafts. The arrowheads are made of flint, and feathers were attached to stabilize the arrows in flight. Apparently he had a backpack with an internal frame and a bag made of animal hide. Inside the backpack were birch bark containers, and one was probably used to carry embers to start a fire. He also carried a net, some string, a thong device perhaps for carrying dead birds during a hunt, and fungus thought to be used medicinally. Given the era, and the state of European civilization at the time, the technology is stunning. It shows how deeply seated the engineering mindset is in the human brain. In order to be carrying a copper axe, for example, it implies the ability to mine and refine copper ore and then cast copper objects from molten copper. It is a surprising level of technology to achieve in a primitive culture. >Dutch artists Adrie and Alfons Kennis created this reconstruction of Otzi the mummy based on the latest forensic research.