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'Undefined Flying Object' or commonly known as 'UFO' is undoubtedly one of the most well-known topic to us. Since the beginning of human civilization, we are amazed on objects or matters, which we cannot define. We take the most active part in discussions related to the undefined matters. The eagerness to define the undefined gets boost through these discussions which include a few facts, some imaginations and some exaggerations for sure.

What is UFO? Theoretically, any flying object which we cannot include among the known flying objects, such as – airplane, rocket, helicopter, kite, bird etc, should be called UFO or 'Unidentified Flying Object'. But what we assume is that any flying object that does not belong to earth or not made on earth, should be called a UFO. We have a notion that a UFO must be an extraterrestrial object.

The legend of El Dorado was about a fabulously wealthy city of gold and the king who ruled over it. The story sprang up shortly after the first Spanish explorers landed in Central and South America. Local people told tales of a rich king who plastered his body with gold dust and then dived into a sacred lake to wash it off. Afterward, he would toss gold into the lake as an offering to the gods. The Spanish called the king El Dorado—The Gilded One—because his body was gilded, or covered, in gold. As the tale spread, the city he ruled came to be called El Dorado. Eventually, the meaning of the name changed to include any mythical region that contained great riches. An early version of the El Dorado legend placed the city near Lake Guatavita not too far from modern Bogotá, Colombia.

The Bermuda Triangle, also known as the Devil's Triangle, is a region in the western part of the North Atlantic Ocean in which a number of aircraft and surface vessels are alleged to have mysteriously disappeared and cannot be explained as human error, piracy, equipment failure, or natural disasters. Popular culture has attributed some of these disappearances to the paranormal, a suspension of the laws of physics, or activity by extraterrestrial beings.

A substantial body of documentation reveals, however, that a significant portion of the allegedly mysterious incidents have been inaccurately reported or embellished by later authors, and numerous official agencies have stated that the number and nature of disappearances in the region is similar to any other area of ocean.