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TIL the name Gretchen is not a common stand-alone given name in German-speaking countries but a colloquial diminutive of Grete - from Margarete. Gretchen as a given name is mainly prevalent in the United States

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ybEw TIL that camels are native to North America and used to exist nowhere else in the world.
ANwK7 TIL the planet Mercury has a comet-like tail 15-million miles (24 million kms) long. The tail is made of sodium atoms blasted off of the surface of the planet by the Sun and small meteorite impacts. The tail is very faint, invisible to the naked eye.
xV6Eb UPDATE: 11/6/2015 The SETI Institute reports that after observing the star with its Allen Telescope Array for more than two weeks, it has found no clear evidence for a signal in either narrowband transmissions, which might be used as a hailing signal for a society to announce its presence, or broadband signals, which could be "produced by intense microwaves used to propel rockets servicing the megastructure." (By the way, how clever is it that SETI has deduced how we might detect alien rockets in deep space? Pretty cool.) SETI hasn't given up, however. It continues to monitor the star, and scientists hope to use more powerful telescopes in the near future to listen even more closely. In what sounds more like a Star Wars plotline than real life, astronomers have found a randomly dimming star that may be surrounded by an alien-built megastructure that’s harnessing energy to fuel an advanced civilization. Sound far-fetched? It very likely is. But so far, scientists have been unable to explain away the mysterious phenomenon with more mundane explanations, such as mistaken telescope readings or orbiting planetary material blocking the star's light. For years, astrobiologists searching for signs of intelligent extraterrestrial life have been looking for just this kind of light signature as evidence that a tech-savvy alien civilization is building massive structures to capture energy. Alien hunters have hoped that the light blocked by these structures would be a dead giveaway to their location. In this video, NASA Jet Propulsion Laboratory astrobiologist and National Geographic Emerging Explorer Kevin Hand explains why some scientists think the Kepler telescope could be picking up the signature of such an alien structure, with the light signature serving as a possible clue. The next step, Hand says, is to tune in radio telescopes to listen for transmissions coming from such a society. The SETI Institute has started doing just that. Professional astronomers, citizen scientists, and space nerds of all ages could soon hear the first crackling transmissions from life-forms from a far-off solar system. Much more likely, however, we'll find only silence. But while some of us might be disappointed that our science fiction fantasies may yet remain fantasies, the discovery is a great reminder of how many scientific revelations—especially those most revolutionary to our way of understanding—began in much the same way as this current discovery: a hunch, then a search, and then lots of checking and rechecking the evidence. But, above all, the greatest discoveries are fueled by the imaginations of intelligent earthlings who dare to ask what might be out there, awaiting us. One particularly interesting point about the current find: The random dimming that’s been recorded indicates that if this is a spherical structure, it must have holes. Perhaps we are witnessing a megastructure still under construction, with gaps in the framework. Alternately, it could be an old structure, falling apart and abandoned. If it's the latter, where would the aliens have gone? If anyone with a telescope spots a Death Star heading this way, we're pretty sure NASA would love to know.
loAYA TIL about singer and pioneer sound recording artist George W. Johnson, born in 1846, who sold more than 25.000 wax cylinders. Since every recording was a "master" back then, he would record the same song over and over with several recording devices pointed at him, sometimes fifty or more times a day
JYAQ8 TIL In Denmark it is forbidden to have tattoos done on the face and hands, because Frederik 9. king from 1947-72, joined a maritime education and made a living as a sailor. In that time he got a lot of tattoos. The parliament hoped by passing the ban to prevent the king from having visible tattoos.