Blue light can actually help older adults sleep — but only if they’re exposed at the right time of day
Blue light often gets a bad rap, probably because most of what we know about it is that it wreaks havoc on our sleep. But new ...
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Astronaut On ISS Captures Mysterious Blue Jet Sprite Lighting Up Earth's Atmosphere
"The tops of this [upward directed lightning] are around 75-80km [47-50 miles], boarding on the fringes of space." ...