How did Edward Leedskalnin build Coral Castle all by himself without modern day equipment?
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Leedskalnin is quoted as saying, "I have discovered the secrets of the pyramids. I have found out how the Egyptians and the ancient builders in Peru, Yucatan, and Asia, with only primitive tools, raised and set in place blocks of stone weighing many tons."
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Depends on what you call a "Castle". Most medieval "castles" were built from stone. There were earlier, what could be more termed as "forts" constructed from wood etc. but as stone cutting came in to more common use and society moved in to the "castle age" which were really walled, fortified cities or "citadels" wood was no longer much of a defense against raiders. As to what was the "first" castle, I doubt if that can even be answered as such because a lot of them sprang up around the same time.
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http://www.dickblick.com/lessonplans/castles/\n\nTell your teacher you need help with spelling.
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See refs below.  These are the only pictures I could find.  I don't think he invented any computers but contributed components to the development of missile guidance technology which included a small guidance computer.
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A horseless carriage?
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This site is a guided look at castle design and the reasoning behind the way castles were built:\nhttp://score.rims.k12.ca.us/activity/castle_builder/\n\nThis site has a bunch of links to other sites about designing and building castles:\nhttp://www.42explore2.com/castle.htm\n\nI had to build a castle in 11th grade and we used a lot of Styrofoam and clay for the walls.  Empty cans can make a good base for towers.
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If someone had the abilities to do that then they should rig something up on their own and forget the electric co. all together. Count me in!!!
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In 1871, Chicago suffered a devastating fire. In the years that followed, however, instead of recovering slowly, the city experienced explosive growth, and it quickly began to strain against its natural boundaries. By the 1880s, the available land for new buildings in this area could not keep up with demand; the only alternative was to build up. But in order to achieve the desired height, construction techniques had to change. A new method of building was developed that used a grid of steel beams and columns that were strong enough to support any stresses or forces a building might experience, including both the weight of the floor and the building contents, as well as the force of wind or even, in some areas, earthquakes. And with this new building method, the skyscraper was born and the race for the tallest building began.    Louis Sullivan is actually normally called the Father of the Modern Day Skyscraper, he was a mentor to Frank Lloyd Wright
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he created the first laser
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try this link\nhttp://www.invent.org/hall_of_fame/106.html
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i built a simple one using seveal pairs of stainless steel knives and caning jars. It wasnt feasable for practical use, but it was a good demonstration of fuel cell theory. I used solution of water and baking soda. \nThe stainless steel knives were used because stainless steel contains nickle which is a catylyst for the full cell process. (platnuium is much better catylyst, but much more expensuve.) I combined the cells in seriese and ran a curent over them until bubles apear on the knives and then removed the current.\nNext i put a led light over the leads of the cells, and then it lit for about 5 seconds as it absorbed the hydrogen and converted it to electricity.\nIt operated similar to a capisitor in this setup.
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When I did it by myself
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how did he do that. i think it will come back on it own.
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How did he manage to invent a naturally occurring mineral?
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He didn't have to do anything.\nThe Ark that he built was specially designed to withstand the terrible deluge that was coming.\nThe ARK was not designed as a true boat. It wasn't built for navigation...it was only designed to stay afloat and to survive the weather conditions from the Flood.\nOther water craft would not have been able to survive...although I'm sure people tried every means they could.\nTo know more about the Flood and the ARK...go to the sources I've provided below.\nGod bless.
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A short distance off the coast of the remote Micronesian island of Pohnpei lies one of the greatest archeological mysteries in the world, the Lost City of Nan Madol. Built on an ancient coral reef and covering more than 11 square miles, this ancient city is made up of hundreds of artificial islets, intersected by numerous manmade canals. Even more curious, many of the city’s larger islands are connected by submerged tunnels. First discovered in the early 1800’s by European sailors, this baffling and immense megalithic stone city may contain evidence for the fabled lost continent of Mu.\n\nThe mysterious Nan Madol is built entirely out of gigantic magnetized basalt crystals, some weighing as much as fifty tons. In fact, the entire city contains an estimated 250 million tons of the prismatic basalt rock.
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A few hours from where I live, there's a place called Tinkertown. It's filled with all sorts of things: a miniature circus, little dioramas, etc. The guy who built it do so over the course of many years. The thing I remember most about it is the sign that he posted, that said "I did all this while you were watching TV."