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When you enter into any new area of science, you almost always find
yourself with a baffling new language of technical terms to learn before you can converse with the experts. This is certainly true in astronomy both in terms of terms that refer to the cosmos and terms that describe the tools of the trade, the most prevalent being the telescope. So to get us off of first base, let’s define some of the key terms that pertain to telescopes to help you be able to talk to them more intelligently. The first area of specialization in telescopes has to do with the types of telescopes people use. The three designs of telescopes that most people use are the Refractor, the Reflector and the Schmidt Cassegrain telescope. The refractor telescope uses a convex lens to focus the light on the eyepiece. The reflector telescope has a concave lens which means it bends in. It uses mirrors to focus the image that you eventually see. The Schmidt Cassegrain telescope uses an involved system of mirrors to capture the image you want to see. A binocular telescope uses a set of telescopes mounted and synchronized so your view of the sky is 3-D. Beyond the basic types, other terms refer to parts of the telescope or to the science behind how telescopes work. Collimation is a term for how well tuned the telescope is to give you a good clear image of what you are looking at. You want your telescope to have good collimation so you are not getting a false image of the celestial body. Aperture is a fancy word for how big the lens of your telescope is. But it’s an important word because the aperture of the lens is the key to how powerful your telescope is. Magnification has nothing to do with it, its all in the aperture.
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Rickytaw
Where did Yemeni coffee shops come from?
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In the Middle East, coffee isn’t a grab-and-go drink used to wake up with, but a social exchange. While coffee beans originated in Ethiopia, the earliest evidence of cultivation appeared in Yemen through trading across the Red Sea.
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The practice followed into the early 20th century and across the world, when the first wave of Middle Eastern immigrants came to Detroit to work in the auto industry or shipping yards, Howell said. Most immigrants were men who migrated alone, so one of the first institutions they created were coffee houses where they would gather to socialize, share news about their home country, and even write letters back home. Many of the initial mosques in the area were originally established in the backs of the coffee houses.
Yemeni men working in shipping on the Great Lakes “would work for months at a time and then have a few weeks off and then work again,” leaving them unable to visit their families back in Yemen, Howell said. “The coffee houses in the Detroit area were a really important institution.”
“Our mission is to bring everyone in one place and share history,” Ibrahim Alhasbani, founder of the first contemporary Yemeni coffee chain Qahwah House, told CNN. “That’s why we serve the coffee in a pot. People come inside the store and they share one pot and they can talk and they share different stories.”
A new chapter for Yemeni coffee
Contemporary chains are designed by a new demographic — the descendants of these immigrants who are bringing Yemeni coffee culture to the American mainstream.
The very first Qahwah Houses in Dearborn were airy and upscale, a familiar setting to patrons of established coffee chains. But they also brought with them Yemeni culture, with coffee beans imported from local farmers, artifacts from the region and the founder’s family tree on the wall.
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