The creation of the propeller can be traced back to Leonardo da Vinci. Da Vinci's "helical screw- helicopter is believed to be the ancestor of the air propeller and the helicopter rotor. ... The basic propeller had evolved from the simple concepts of da Vinci, and was slowly becoming an effective means of aerial propulsion. ...
The Evolvement of Contact Lenses Improvements in regards to better sight have come a long way over time. This is due to inventions and developments with eyeglasses, bifocals, and most of all, contact lenses. In 1508, Leonardo da Vinci sketched and formed several forms of contact lenses (Adelin...
Before Christianity became a force in Europe, many cultures worshiped numerous "gods" and deities. The Greeks, Romans and Egyptians all believed in more than one god and prayed to them for guidance, provision, health and safety. For instance, the Greeks and Romans were host to a multitude of gods; ...
Allen Ginsberg once said, "You can't escape the past in Paris, and yet what's so wonderful about it is that the past and present intermingle so intangibly that it doesn't seem to burden." Paris was established over 2000 years ago and is therefore a very rich city in terms of history and culture. I b...
Since childhood, traveling has always been one of my hobbies. In the summer of 2002, my four friends and I planned to take a seven day trip to Europe. Most of Europe lies in latitudes more northerly than New York, due to which it has warm, Atlantic currents with moderate temperature. The Alps can b...
