1 Discard any hammer with mushroomed or chipped face or with cracks in the claw or eye sections. 2  Wear safety glasses or goggles, or a face shield (with safety glasses or goggles).  Strike a hammer blow squarely with the striking face parallel to the surface being struck.
The first jet airplane was the Heinkel He 178 made in Germany in 1939, right before the outbreak of World War II .
First Airplane Flight. The first successful flight of a powered airplane occurred at Kitty Hawk, North Carolina, on December 17, 1903. The plane's designers were Dayton residents Orville and Wilbur Wright, who until that point had made a living by building bicycles.