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May 24, 2012
Jeff Jacoby: The peace process battered Israel's reputation
Michael Muskal: 'Pro-choice' position hits record low, according to poll
Chris Farrell: Are We in a Tech Bubble?
The Kosher Gourmet by Penelope Wall: PHILLY CHEESE STEAKS --- hold the steak!
May 23, 2012
Tony Pugh: More private colleges offering tuition discounts
Mary Beth Franklin: How to Choose the Right Annuity for You
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
Warren Richey: Can US group challenge overseas surveillance act? Supreme Court to decide
Thomas M. Anderson: Walking Away From a Mortgage
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
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
Steven Goldberg: 5 Great Stock Picks and the Exchange-Traded Fund that Owns Them
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
Amina Khan: Research links coffee to lower death rates
The Kosher Gourmet by Faith Duran : Cheesy Potato Breakfast Casserole with Cheddar and Sun-Dried Tomatoes
May 16, 2012
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
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
The Kosher Gourmet by Kathy Hunt: Spread a Little Excitement with EXOTIC CONDIMENTS (4 RECIPES)
May 14, 2012
Lisa Gerstner: How to Protect Your Identity, Finances If You Lose Your Phone
Harvard Health Letters: Heart disease and dementia
The Kosher Gourmet by Megan Gordon: MANGO COCONUT OAT MORNING MUFFINS are a bright but hearty delight
May 11, 2012
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
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
Jeff Bertolucci: Get Home Phone Service for Less Than $10 a Month
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
Sharon Palmer, R.D. How you can reduce your risk -- or delay -- chronic diseases associated with aging
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Jewish World Review
How wildfire fighting works
By
Marshall Brain
http://www.JewishWorldReview.com | (MCT)
If you have been watching firefighters battle the wildfires in California, you know that they are using many different technologies. Some of these technologies are as old as human intelligence, while others are brand new.
The most photographic of all the technologies involves airdrops. You have probably seen news footage of airplanes and helicopters dropping huge plumes of red fire retardant on the fires. What is the liquid, and why is it red?
A typical airplane to use is the C-130. Inside the C-130 are tanks that hold 3,000 gallons of liquid. It is possible to dump 3,000 gallons of normal water, but usually they add two things to the water when fighting a wildfire. The first is a red dye. The dye is handy because it leaves a big red mark on the ground to let the next pilot know which areas have already been hit.
The second is a product called Phos-Chek. It's what is known as a "Long-Term Fire Retardant". The two main ingredients in Phos-Chek are ammonium phosphate and diammonium sulfate, both of which are forms of fertilizer.
One advantage of Phos-Chek is the fact that it lasts. It creates a no-burn zone until it is washed off by a strong rain.
You may have also seen trucks covering houses in what looks like foam. In most cases it is actually a polymer gel made of sodium polyacrylate. This is the same chemical that you find in disposable diapers to absorb liquid and prevent leaks.
The polymer mixes with water to form a gel that coats the house and can last 12 to 24 hours. When the fire comes, it has to boil off all the water in the gel coating before it can light the house on fire. With a gel coating about a quarter of an inch thick, the fire is gone before all of the water in the gel evaporates, and the house is untouched by the fire.
NASA was also helping out this year, providing robotic airplanes with infrared cameras. The cameras can penetrate smoke to map out new fires and hot spots, making it easier to track the blaze as it develops.
There are also the old standbys. Bulldozers can cut firebreaks through fields and forests on level terrain. The basic idea here is to simply remove burnable material from the path of the fire so that the fire dies when it hits the firebreak. In remote areas and in hilly terrain, the bulldozers aren't available. It's up to human beings to build the firebreaks by hand.
The people who fight fires this way are called hotshots. It's a dangerous job. Hotshots work in teams and are often very close to the fire. For protection they wear fireproof Nomex shirts that are usually bright yellow to improve visibility. Using shovels, axes and chainsaws, hotshots create a firebreak. Hotshots use radios and GPS receivers to keep track of the fire, and helicopters drop drinking water and supplies.
Sometimes things get out of control. A change in wind direction can bring the fire right on top of a hotshot team. In that kind of situation, hotshots carry a piece of technology that they use as a last resort. It is a small tent-like structure called a fire shelter and it only weighs about half a pound. The key is a reflective aluminum foil shell that reflects the radiant heat of the blaze.
Even with all of this technology and manpower, a wildfire is still a powerful enemy with a mind of its own. As we saw this year, hundreds of thousands of acres can be consumed by a big fire before people can bring it under control.
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 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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