May 22, 2012 David S. Cloud and Kathleen Hennessey: Obama changes mind on Pakistan invite to NATO summit --- and then gets dissed by country's president US Senate approves new sanctions against Iran ahead of Baghdad talks Warren Richey: Can US group challenge overseas surveillance act? Supreme Court to decide Supreme Court: Twins can't claim dead dad's benefits Thomas M. Anderson: Walking Away From a Mortgage Environmental Nutrition editors: The lowdown on a low-acid diet Pomegranate juice maker used deceptive ads, FTC judge rules Relatives outraged over spoof on Hamas chief's killing The Kosher Gourmet by Megan Gordon: Enjoy a celebration of the most rich and layered flavors: Black bean, sweet potato and quinoa chili May 21, 2012 Mark Clayton: Cybersecurity: How US utilities passed up chance to protect their networks Howard LaFranchi: NATO summit: Who will foot the bill for long-term Afghanistan security? Chris Farrell : Earn Dividends in Emerging Markets with This WisdomTree ETF James K. Glassman: 5 Stock Picks Among Online Retailers Stephen Whiteside, Ph.D. : Mayo Clinic Medical Edge: Social anxiety disorder --- or just shy? Guy Jackson : Victim's father regrets death of Lockerbie bomber The Kosher Gourmet by Mario Batali: Famed chef's veal shoulder farsumagru: A festive meat course for late spring May 18, 2012 Rabbi Berel Wein: Striving: The People of the Book's Book for (All of) the People Caroline B. Glick: Embracing dangerous delusions and not our friends Steven Goldberg: 5 Great Stock Picks and the Exchange-Traded Fund that Owns Them Janet Bodnar: How to Teach Kids to Handle Credit Cards Mary Pickett, M.D.: Ask the Harvard Experts: Don't be forced into gluten-free lifestyle based merely on a doctor's false-positive test The Kosher Gourmet by Carolyn Malcoun: DIY healthy lunchbox treats: HOMEMADE FRUIT BARS for kids and brown-bagging adults alike May 17, 2012 Warren Richey: Teacher fired for being unwed and pregnant can sue religious school, court rules Josh Mitnick: Netanyahu's 'centrist' coalition is already proving it's anything but Steven Goldberg: Earn Dividends in Emerging Markets with This WisdomTree ETF Mary Beth Franklin: Retirement Savings Tips for New Grads Amina Khan: Research links coffee to lower death rates Chelsea Sheasley: Social media: Is it too feminine? 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What you need to know before you buy Kathy Kristof: Our Practical Investor Fights Inflation with These 6 Investments Sue Hubbard, M.D.: The Kid's Doctor: Lactose intolerant young child? Check again Environmental Nutrition Editors: Get the facts on palm sugar sweetening The Kosher Gourmet by Kathy Hunt: Spread a Little Excitement with EXOTIC CONDIMENTS (4 RECIPES) May 14, 2012 Richard Simon: Purple Hearts for domestic terror victims? Nando Pelusi, Ph.D.: The privacy paradox: Surrounded by strangers, we risk isolation, anxiety Chris Farrell: Investing Lessons from the Great Recession Lisa Gerstner: How to Protect Your Identity, Finances If You Lose Your Phone Harvard Health Letters: Heart disease and dementia Tiffany O'Callaghan: New hormone mimics effects of exercise without the sweat The Kosher Gourmet by Megan Gordon: MANGO COCONUT OAT MORNING MUFFINS are a bright but hearty delight May 11, 2012 Rabbi B. Shafier: Why happiness will always be elusive Charles Krauthammer: Echoes of '67: Israel unites Howard LaFranchi: With G8 snub, US-Putin 'reset' off to stumbling start Jeremy J. Siegel: Investors, Relax About Rising Interest Rates Jessica L. Anderson: Get the Best Deal on a Used Car Jett Stone: Forget face-lifts and fake knees. Scientists have seen the fountain of youth --- and it's broccoli The Kosher Gourmet by Chef Mario Batali: The famed chef's vegetable dish that tastes true to the season: FAVAS AND SUGAR SNAP PEAS WITH POTATOES AND TARRAGON May 10, 2012 Clifford D. May: The Real Palestinian Refugee Problem Sergei L. Loiko: Putin sends warning to U.S., NATO in Victory Day speech at Red Square Mary Rourke: How being a 'mentch' got Vidal Sasoon his start and fighting in Israel's War of Independence provided him with confidence and a strong sense of his own identity Harvard Health Letters: Palliative care: Underused therapy yields surprising benefits Jeff Bertolucci: Get Home Phone Service for Less Than $10 a Month Rachel L. Sheedy and Susan B. Garland : Make the Right Moves to Boost Benefits The Kosher Gourmet by Betty Rosbottom: Gleaming with its golden, crimson, and snowy white hues, this silken smooth and creamy STRAWBERRY ORANGE TRIFLE looks impressive, but is easy to prepare May 9, 2012 John Rosemond: Parents, stop destroying the American male Valerie J. Nelson: Maurice Sendak, author of 'Where the Wild Things Are,' dies at 83 Bob Frick: Angst Over Annuities Sharon Palmer, R.D. How you can reduce your risk -- or delay -- chronic diseases associated with aging Howard LeWine, M.D.: Ask the Harvard Experts: Why did my blood pressure suddenly shoot up? Lisa Gerstner: Lower the Rate on All Your Loans The Kosher Gourmet by Emily Ho : Springtime soba with miso sauce offers a coloful mix of fresh textures and flavors May 8, 2012 Edmund Sanders: Netanyahu suddenly cancels new elections, forms unity government Frank J. Gaffney Jr.: Farewell to European superstate Anne Kates Smith: 4 Stocks That Mimic Buffett and Berkshire Hathaway Gaia Vince and Clare Wilson The Rise of Miniature Medical Robots: Fantasy Fast Becoming Reality Paul Takahashi, M.D.: Mayo Clinic Medical Edge: Never suffer night leg cramps Jessica L. Anderson: Extended-Warranty Warning The Kosher Gourmet by Diane Rossen Worthington: Celebrate National Chocolate Chip Day with the Best Cookie Ever (Includes techniques) May 7, 2012 Mark Clayton: Homeland Security warns major cyber attack aimed at gas pipeline industry underway Angus Roxburgh: Putin Decoded: World view of a Russian feeling dissed Kimberly Lankford: Navigate a Course for Long-Term Care Kevin McCormally How to Adjust Your Tax Withholding Celeste Robb-Nicholson, M.D.: Harvard Health Letters: How do you treat a Baker's cyst? Joanne Capano: Healthy Snacks for Children: The Choices May Surprise You The Kosher Gourmet by Penelope Wall: Classic Creamy Spinach Dip with a Fraction of the Calories and Fat May 4, 2012 Rabbi Nathan Lopes Cardozo: Holy 'trivialities' Jonathan Tobin: Bibi v. Barak will be no contest this time around Steven Goldberg: Blue Chip Stocks On Sale Worldwide Art Pine Slow Productivity Growth a Blessing --- For Now Sue Hubbard, M.D. : The Kid's Doctor: Are Kids Too Wired? Kerri-Ann Jennings, M.S., R.D: Foods that are good for your smile Amy Paturel, M.S., M.P.H.: Eating Well: Foods that are good for your smile The Kosher Gourmet by Betty Rosbottom: Strawberry rhubarb parfaits are elegant yet simple to assemble May 3, 2012 Michael Freund: Who's Afraid of the Messiah? Clifford D. May: The Foggiest War Susan B. Garland: Insurance to Cover Old Old Age Steven Goldberg 6 Reasons to Bet on a Big Bull Market Harvard Health Letters: Treating prostate cancer --- no rush to judgment Larry Gordon: Harvard, MIT partner to offer free online courses Naomi Nix : Man gets free trip to Chicago after postcard sent by mother in 1957 finally reaches him The Kosher Gourmet by Diane Rossen Worthington: Intensely Italian vegetable frittata is a seriously simple standby

Jewish World Review How concentrating solar collectors work By Marshall Brain http://www.JewishWorldReview.com | (MCT) We hear so much about carbon dioxide and global climate change, and every day it seems like the price of gasoline is rising again. You might be wondering if there is anything that we can do, as a society, to solve these problems. One possible answer is solar energy. And it turns out that there are some gigantic solar projects currently getting underway in the United States. The largest of these is a 500 megawatt plant in California. 500 megawatts is a lot of power - enough to run a small city. Why solar? Because the sun's energy is free and abundant. Each square yard of earth's surface receives about 1,000 watts of free energy on a bright sunny day. In other words, the earth receives thousands of times more energy from the sun than humans will ever need. All we have to do is find inexpensive ways to convert all of this light into electricity, and our energy problems are solved. There are several different ways to use solar power. One of the simplest is a solar water heater. It has been said that in China there are so many solar water heaters on people's roof tops that it saves the country from having to build 40 power plants. There are also large photovoltaic panels that convert sunlight directly into electricity. You frequently see these panels on rooftops, especially in California. However, almost all of the large-scale projects use something called concentrating solar collectors. There are four different ways for concentrating collectors to work, but all of them have one thing in common: they use mirrors to concentrate sunlight. One of the simpler systems is called a parabolic trough collector. A trough collector looks like a half tube, with the inside of the tube mirrored. Sun reflects off the mirror and hits a pipe running down the center of the tube. Inside the pipe is mineral oil that reaches temperatures as high as 500 degrees F. This hot oil is used to boil water, creating steam that drives a turbine and electrical generator. Another simple mirror system uses a parabolic dish lined with mirrors. These collectors look something like large satellite TV antennas. They reflect the sun's light to a point, and at that point are one of two things. The first possibility is a Stirling heat engine. A Stirling engine converts heat to motion, and the motion drives an electrical generator. Less common but growing in popularity are small water-cooled photovoltaic panels. The super-intense sunlight creates lots of electricity directly in the small panel, and water keeps the panel from melting. Finally there are the tower systems. A tall tower of some sort sits in a field of large, moveable mirror panels. The mirrors all rotate so that they reflect their sunlight at the top of the tower, which gets incredibly hot. This heat can boil water, creating steam that drives an electrical generator. Some newer systems use the heat to melt salt or graphite, which can be stored for nighttime power generation. You might imagine that solar power has a big disadvantage - there is no sunlight at night, meaning no electricity. But engineers are working on ways to store power overnight to eliminate this problem. In one system, excess electricity created during the day drives giant air compressors. The compressed air goes into huge underground salt domes. At night, the compressed air drives generators. In another system, the excess electricity drives pumps that move water to an uphill lake. Then during the night the water flows through generators to a downhill lake. As already mentioned, molten salt is another system with potential. As petroleum gets more and more expensive, solar energy looks better and better from both the financial and the environmental angles. We should be seeing many more large solar projects getting under way in the near future. Every weekday JewishWorldReview.com publishes what many in the media and Washington consider "must-reading". Sign up for the daily JWR update. It's free. Just click here. Comment by clicking here. Previously: How your key fob works How the common cold works How the Large Hadron Collider Works How making a TV show works How dry cleaning works How exoskeletons work How an oil refinery works How landfills work How the Orion spacecraft works The cutting edge in HDTV Redefining the CD How the HDMI cable scam works How glow-in-the-dark toys work How the subprime mortgage crisis works How gift cards work How Tasers work How giant TV screens work How foreclosure works How Air Force One works How wildfire fighting works How vitamins work How ejection seats work How reattaching limbs works How hot air balloons work How paparazzi work How counterfeiting works How CDs work How the Edsel worked How Stinger missiles work How hybrid cars work How sharks work How mosquitoes work How diesel engines work How water towers work How the Dawn mission works How Kassam rockets work How the North American Eagle works Why aren't we flying to work? How tofu and soy milk work How Colony Collapse Disorder works How airbags work How the U.S. income tax works How gum works How caffeine works How Daylight Saving Time works How a cruise missile works How snow making works © 2007, How Stuff Works Inc. Distributed by McClatchy-Tribune Information Services.

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