26Deep Sea Animals
Red light does not reach ocean depths, so deep-sea animals that are red actually appear black and thus are less visible to predators and prey.
27. The Sun is a white star. It appears yellow in the sky because the blue part of the visible spectrum is scattered away by the atmosphere. This is also the reason why we see a blue sky.
28. Part of the static seen on old TV sets is caused by cosmic microwave background radiation from the Big Bang.
29. The Aurora Borealis (Northern Lights) and Aurora Australis (Southern Lights) also emit light rays outside the visible spectrum range, but the ultraviolet light gets absorbed by the atmosphere before it reaches us on the ground.
30. Since red wavelengths of light are absorbed in the first 10-20 feet of water, blood looks green below 50 feet of water.
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31Infrared Light Detector
You can see the invisible infrared light produced by your remote control if you point it into a digital camera (webcam, phone, etc.).
32. Smoke detectors use gamma-ray radiation to detect smoke in the air.
33. Low doses of ionizing radiation can be beneficial rather than detrimental in humans by stimulating the activation of cellular repair mechanisms that protect against disease. This phenomenon is known as Radiation Hormesis.
34. Very Low Frequency radio communications used by submarines diffract around mountains due to their long wavelength, and their use creates an artificial bubble around the Earth which protects it against solar flares and coronal mass ejections.
35. The main reason eyes see in the "visible spectrum" is because the earliest species to develop photosensitivity were aquatic, and only two specific wavelength ranges of electromagnetic radiation (blue and green visible light) can travel through water.
