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Visible light is just a minuscule part of the electromagnetic spectrum Figure 51 wavelengths are very weak by definition. The shape, the propagation and the properties of waves are diverse. Therefore, the universe is made of countless wave networks interacting in accordance with these criteria. From a scientific point of view, materiality does not have any significance as such. The boundary between materiality and immateri- ality is a problem of scale and interaction. Ultimately, a wave is simply a space-time ratio. The most astute readers will find that their knowledge is put to the test. You may even be in denial. The biggest problem of understanding reality is grasping the true meaning of time. We can approach reality if we consciously make the effort to retreat from the world. Nevertheless, do not worry if you are not quite familiar with the following explana- tion. It refers to scientific and spiritual prerequisites. Read this part at your leisure. Some words or sentences will appeal to you more clearly than others. We are used to saying that “what is conceivable is stated clearly.” However, as we have already seen, reality is not in conform- ity with its description, because the latter cannot encompass it by nature. Feynman, one of the greatest physicists of the twentieth cen- tury, said: “I can say without the risk of being mistaken that nobody understands quantum mechanics...Do not keep saying to yourself, if you can possibly avoid it, ‘But how can it be like that?’ because you will get ‘down the drain,’ into a blind alley from which nobody has yet 202 The Science of Extraterrestrials: UFOs Explained at Last * Eric Julien The electromagnetic spectrum