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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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What the rising popularity of Yemeni coffee shops says about third places
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The most popular spot on a late Friday night in a pocket of Manhattan’s West Village isn’t a trendy bar or a Michelin-starred restaurant but a Yemeni coffee house chain strictly serving coffee, tea and pastries.
A step into Qahwah House on Carmine Street offers a rich whiff of cardamom, Arabic music and crowds of people both at tables and in line to order. The energy spills over into the sidewalk, where some begin performing a Levantine folk dance known as dabke. It’s a snapshot of various Eastern cultures; Arabic, Farsi and Urdu fill the air, and some customers don traditional attire.
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Qahwah House is just one of a string of Yemeni coffee chains that originated in the Arab-populated Detroit area and are rapidly springing up across the country, often where there are significant Middle Eastern and Muslim populations. Nineteen Qahwah House locations are open across seven states, with more under construction and expected to open this year. Another chain, Haraz, opened this month in the pricey SoHo neighborhood in Manhattan, with at least six more in the region planned in the next two years. Times Square will be home to two other chains, MOKAFE and Qamaria Yemeni Coffee Co.
The rapid expansion of these shops underscores the demand for late-night social spots for not only young Muslims and Middle Easterners, but also younger people who are looking for a non-digital third space where they can hang out without alcohol or having to yell over loud music.
They don’t have many other options. Malls, a traditional third place for young people, are growing more and more unpopular. Chains like Starbucks have become more like take-out counters. Alcohol-free lifestyles are growing even for those outside of the Muslim faith, which many practicing the religion already take part in.
So for many young people in urban areas, especially those from immigrant communities looking for a way to connect to their cultures, it’s a great option.
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