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" ... All this should tell you that “radiation” is a very broad term. It includes ionizing radiation that can destroy or alter DNA in your cells. But it also includes visible light, thermal radiation, and radio waves. Cell phones, stoves or flashlights do not emit ionizing radiation. (Actually, flashlights might… visible light comes close to being able to, well, if not outright ionize atoms, at least break some molecular bonds and cause chemical changes.) Nor do cell phones emit non-ionizing radiation in sufficient quantities to thermally damage tissue, like a strong light, a hot stove, or for that matter, a microwave oven could. ... "
" ... But without the additional gravitational effects that dark matter adds, those first stars would cause a catastrophe. Stars don't just emit visible light, but large amounts of ultraviolet, ionizing radiation as well. They emit jets of particles and blow off large amounts of fast-moving matter in the form of stellar winds. And for the first stars of all, which are much more massive than today's stars, these effects are even more severe. ... "
" ... Most air purifiers on the market today use electrostatic precipitation: they charge or ionize particles and then attract them to a collector. Unfortunately, these ionizing air purifiers also create ozone, which is great in the ozone layer but bad in your lungs. ... "
" ... The Science: Let's not pretend this nebula that they show is in any way realistic. It's not even visually attractive; it's designed to be pink and green lightning clouds. They claim it's filled with "radioactive" material, even though it's the high-energy, ionizing radiation that causes greens (with doubly ionized oxygen at ~50,000 K) and pinks (with ionized hydrogen at somewhat lower temperatures). But in real life, these regions are large and diffuse, and only show up because they're powered by external or internal radiation, like newly formed stars. All of this would be perhaps excusable if it were visually attractive, but it's not. It looks like someone went fingerpainting with a visual effect and two different-colored fingers. ... "
" ... The atmosphere of Earth, as seen during sunset in May of 2010 from the International Space Station.... [+] The ozone in our stratosphere is a vital ingredient in protecting humans from high-energy, ionizing ultraviolet radiation. ... "