Nazis. Say what you want about them, but we are lucky Hitler was crazy. He got in the way of his generals, who were true geniuses of war. If left to run the war, many grave tactical errors such as the ill-conceived invasion of Russia, would never have happened.
Not only that, but the scientists and engineers in the employ of German forces were many years ahead of their time. Consider the following (click here for a great site that goes into detail about these weapons. Several of the pics on here are from that blog):
The German Luftwaffe (to the best of my knowledge) never developed a four-engine bomber. This seriously hampered the range with which the German air force had to operate within. The design at left called for six engines. It was called the Amerikabomber.
Not too difficult to figure out what it was meant for.
This one was called the Horton Flying Wing. Notice the similarity to our modern day stealth aircraft. Doubtless this aircraft, had it ever flown, would have had a similar small radar signature.
The Arado radio-controlled glide bomb. Essentially, this would have been the world's first cruise missile. Notice the diagram showing a jet engine bomber carrying the weapon.
Space bomber. German engineers actually theorized about an aircraft that would launch, orbit to an American city, then strike. The air/spacecraft would then return and land the same as a conventional aircraft would. Not too far an idea from our space shuttle program. Did I mention that an enormous amount of NASA scientists and engineers were gleaned from Germany during Operation Paperclip?
They even had space suits developed for the pilots.
Then there is the curious case of Die Glocke, or "The Bell" in German. It is a supposed wunderwaffe, or "wonder weapon" devised by Nazi scientists in the waning days of the war. This oddly-shaped object was said to levitate and fly via the use of anti-gravity technology. Crazy? Well, the UFO object that is said to have crashed in Kecksburg, Pennsylvania in 1965 bears an uncanny similarity to the description of this alleged device. Did the Germans develop anti-gravity drives?
Here you go. A monster tank...that no road could support.
And this one...well, you can be the judge of its authenticity. ;)
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