May 24, 2012 Jeff Jacoby: The peace process battered Israel's reputation Near-nuclear nation threatens to walk out of summit unless it gets its way Clifford D. May: What Iran's Rulers Want Michael Muskal: 'Pro-choice' position hits record low, according to poll Chris Farrell: Are We in a Tech Bubble? Kimberly Lankford: Switching Medicare Advantage Plans Mid-Year Bryan McIver, M.B., Ch.B., Ph.D.: Mayo Clinic Medical Edge: Understanding hyperthyroidism and its variety of treatment options French rights groups want Google to stop suggesting 'Jew' Two-fly rule for Beijing toilets The Kosher Gourmet by Penelope Wall: PHILLY CHEESE STEAKS --- hold the steak! May 23, 2012 Ex-CIA spy in Iran's Revolutionary Guard: Baghdad talks highlight Western naivete Putin's latest defiance shows Obama's whisper didn't work Tony Pugh: More private colleges offering tuition discounts Lisa Gerstner: 4 Money-Etiquette Questions Answered Mary Beth Franklin: How to Choose the Right Annuity for You Art Markman, Ph.D.: Get smart: How to bulk up your creativity muscles Israeli scientists use skin cells to help repair heart muscle Tina Susman: The wig wasn't enough: Man gets 13 years for posing as his dead mom The Kosher Gourmet by Emma Christensen:A simple way to do fish right 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? The Kosher Gourmet by Faith Duran : Cheesy Potato Breakfast Casserole with Cheddar and Sun-Dried Tomatoes May 16, 2012 Jackson Holahan: The Aleppo Codex Jonathan Tobin : Iran Declares Victory in Nuclear Talks Kiplinger Reports, Summarized Anne Kates Smith: 7 Stocks That Let You Sleep Tight Carmen Terzic, M.D., Ph.D. : Mayo Clinic Medical Edge: A variety of exercises can help improve balance Melissa Healy: National strategy on Alzheimer's disease aims to halt it by 2025 The Kosher Gourmet by Joyce White : GOODNESS GRACIOUS: GREENS! 4 winning recipes that are no longer just for down-home folks (Includes expert tips & techniques) May 15, 2012 Dennis Prager: God and Man at (and for) Liberty Kristen Chick: Obama administration resumes arms sales to Bahrain despite serious unresolved human rights issues. Activists feel abandoned Pat Mertz Esswein: Homes are now affordable again and mortgage rates are low. 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. 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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 jet packs work By Marshall Brain http://www.JewishWorldReview.com | (MCT) Lots of people fall asleep at night, and in their dreams they are able to fly like Superman. If you've ever had a dream like that, you know it feels great. The freedom is amazing. So it's not hard to understand why the idea of a jet pack is so appealing. Imagine being able to put on some kind of backpack and being able to fly wherever you want. We see it in lots of movies. It's easy to imagine. Unfortunately, it has been very hard to turn this concept into reality. But the attempts have been fascinating. By looking at the attempts, it is possible to understand why it has been so hard. The first and most famous attempt is called the Bell Rocket Belt. It and its descendants do allow a person to put on a backpack and fly. The way it works is incredibly simple. On your back are three tanks. One is filled with pressurized nitrogen. The other two hold highly concentrated hydrogen peroxide. This is not the stuff you buy at the drug store. Drugstore hydrogen peroxide is almost all water. Purified hydrogen peroxide is powerful stuff, and it makes a very good fuel. The pressurized nitrogen is there to push the hydrogen peroxide out of the other two tanks. The hydrogen peroxide runs through a pipe and hits a silver mesh catalyst. When it hits the silver, the hydrogen peroxide immediately turns into oxygen and water. The water flashes into high pressure steam because of the heat of the reaction. The steam is then directed out two nozzles to create thrust. The pilot controls the amount of thrust with a hand grip, and controls the direction of the thrust by moving his or her body. An experienced pilot makes flying with a rocket belt look incredibly easy. This system works great. People have flown it in James Bond movies and Super Bowl appearances. The only problem is that every flight lasts less than a minute, because the backpack runs out of fuel. You just can't put enough hydrogen peroxide on your back to fly for very long. How do you get more range from the same amount of fuel? You have to use some kind of engine to move a whole lot of air, rather than using direct rocket-like thrust. There are two ways to move a lot of air: propellers and jet engines. If you think about it, you can see why. To create thrust, you use that classic law of motion: "to every action there is an equal and opposite reaction." So if you use a propeller or a fan to move air, you can take advantage of the reaction to that air's motion. Instead of carrying all of the "action" in your backpack, you take advantage of the air around you and move it with the propeller. What we are seeing right now are people trying to fit propellers and jets into backpacks. There have been several attempts at this, the latest premiering at the 2008 Oshkosh air show. It's called the Martin Jetpack. The Jetpack is a completely different animal. Instead of a relatively lightweight backpack, this machine weighs 250 pounds. It has a 200 horsepower engine powering two ducted propellers. To understand how big this engine is, keep in mind that many cars on the road today make do with less than 100 horsepower. The high-energy engine gives you enough power to get in the air. And it also lets you stay in the air for up to half an hour. With a top speed around 60 miles per hour, you can actually go somewhere with the Jetpack. Will normal people be flying around with their Jetpacks anytime soon? It has taken almost 50 years to get to this point, so we can probably expect a few more years. And the initial prices seem to be in the north-of-$100,000 range right now. It will take time for prices to drop. Still, the possibility is looking a lot better than it did a few years ago. 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 seismographs work How Olympic technology works How Personal Rapid Transit works How 3G works How the Global Position System (GPS) works How octane works How cruise missiles work How submarines work How miles work How octane works How food preservation works How beer works How holding your breath works How smoke detectors work How heat pumps work How your night vision works How concentrating solar collectors work 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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