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Showing posts with label Memorial. Show all posts
Showing posts with label Memorial. Show all posts

Friday, June 8, 2012

Grill Science: 5 Sizzling Tips for a Tasty Memorial Day

Pools open and dusty grills come out of hiding this Memorial Day weekend, as we remember fallen war heroes and honor the living. To ensure your Memorial Day cookouts sizzle, rather than fall flat with dry burgers and pouty pals, here are some tips served up with a healthy side of science.

Also, if you're feeling extra saucy this weekend, you may want to try out a bison cheeseburger, the creation of Dave Joachim, a food writer and author of "Mastering the Grill: The Owner's Manuel for Outdoor Cooking" (Chronicle Books, 2007) and "Fire It Up. 400 Recipes for Grilling Everything" (Chronicle Books, 2011).

1. Know your outdoor cooking method

Although the word barbecue is sometimes used to describe any act of outdoor food preparation, the word actually refers to meat slow-cooked over charcoal or wood. The Memphis in May World Championship Barbecue Cooking Contest, held annually in Memphis, Tenn., defines barbecue even more strictly, as "pork meat (fresh or frozen and uncured) prepared only on a wood and/or charcoal fire."

Because authentic barbecue is cooked at low temperatures, it rarely blackens, though soot from the wood fire may turn it dark brown.

For a crispy-charred crust on your chicken breasts or steak, try cooking on a grill over high heat. The black stuff is made by a simple combustion reaction; the heat causes the amino acids (which make up the meat's proteins) react with sugars inside the meat, leaving behind blackened, partially combusted carbon.

A little bit of charred carbon can lend a smoky flavor to meat, but a lot can be dangerous. A study presented at the 2006 American Association for Cancer Research meeting found that the chemicals in charred meat raised the risk of prostate cancer in rats, and a 2009 study presented at the American Association for Cancer Research meeting found that pancreatic cancer in humans is linked to consumption of well-done meat. [7 Foods Your Heart Will Hate]

2. Grill a healthier patty

Eating red meat can come with some guilt, as the juicy goodness has been linked to all kinds of health hazards, from cancer to cardiovascular disease. But if you're hankering after a juicy burger, guilt-free, try an herbal topping.

Studies show that herbs in the Lamiaceae family — such as rosemary, sage, and oregano — may keep meat from causing cancer. As part of an ongoing Food Safety Consortium project at Kansas State University, researchers found that burgers marinated with rosemary had 70 to 80 percent less heterocyclic amines (HCAs) than those soaked in a plain marinade. (HCAs can mutate DNA and are suspected carcinogens.)

When you throw a raw steak or patty on a hot grill, the meat's amino acids and sugars produce unstable compounds called free radicals. These radicals then react with beef's creatine to make HCAs, Kansas State researcher J. Scott Smith, a professor of food chemistry, explained to LiveScience in a past article on healthy burgers.

Herbal antioxidants halt this process, chemically soothing the free radicals before they start creating mutagens all over your basic backyard burger or a beautiful porterhouse steak. While marinades are best because they cover the whole surface, simply shaking on dried herbs may reap the same health benefits.

3. Choose a gas, charcoal or wood grill

This decision can be an important one, as the grills burn at different temperatures with different amounts of moisture. Charcoal and wood burn hotter, and drier, than gas.

That's because propane contains moisture, Joachim said. For every hour of grilling on gas, you release a half-cup to a cup of water vapor into your grill. That keeps the temperature down and prevents the formation of a seared, browned crust on your meat. [Top 10 Gas Grills of 2012]

Some gas grills now come with a sear burner, or a ceramic block that holds heat better than the grill grates. Because the burner can build up more heat, home grillers can use it to brown the outside of a steak or pork chop to get that dark crust, he added.

Speaking of sear, why is it so yummy? The secret is the Maillard reaction, named after Louis-Camille Maillard, who was the first to study this chemistry in the late 1900s. When you apply heat to your burger or other meat, the amino acids hidden inside react with sugars to create hundreds of flavor compounds. Maillard reactions make pretty much everything taste amazing, including roasted coffee, grilled vegetables and even your morning toast.

4. The secret to the juiciest burgers

"The trick with ground meat is once you grind up meat, you're grinding up the muscle fibers, and these are what hold the moisture in," Joachim told LiveScience. "What I recommend doing is adding moisture back in."

That added moisture can take many different forms: Try apple butter in turkey burgers and steak sauce in hamburgers. And if you're exhausted from Memorial Day preparation, you can just mix ice water into the ground meat, along with whatever seasonings you're adding. Not only does the ice water add moisture, it also keeps the center of the burger cool so it doesn't overcook.

The other key component of the perfect burger — turn off the nutritionist in you — is fat. Joachim recommends ground beef with 80 percent protein and 20 percent fat. Rather than making a burger juicier, the extra fat stimulates saliva production, moistening your mouth.

5. Grab the veggies

To entertain even the pickiest of vegetarians, the grill may be your best bet.

The trick to grilling vegetables is remembering that they're edible raw, Joachim said, so you don't need to leave them on the grill until they scream for mercy. Just oil them, sear them over medium-high heat and enjoy. For firmer veggies like corn, you'll need a little more time. For corn, simple is best: Throw the ears, husks and all, on the grill over medium-high heat and let them cook for 15 or so minutes, turning occasionally, until the husks are blackened. Inside, the corn will be perfectly done. [10 New Ways to Eat Well]

If you're cooking up veggie burgers, try to dress them up with masculinity — by searing in those manly grill marks or covering it with the usual burger toppings — as a recent study found guys may snub such vegetarian alternatives due to their "girly" image.

Follow LiveScience for the latest in science news and discoveries on Twitter @livescience and on Facebook.

Copyright 2012 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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Sunday, June 3, 2012

Astronauts to Spend Memorial Day Unpacking Private Space Capsule

Rather than kick their feet up this Memorial Day weekend, the astronauts aboard the International Space Station will be unloading cargo from the first private spacecraft ever to visit the orbiting lab.

SpaceX's unmanned Dragon capsule docked with the station Friday (May 25), making spaceflight history in the process. Another milestone came Saturday at about 5:53 a.m. EDT (0953 GMT), when the hatches between Dragon and the $100 billion orbiting lab were opened.

The station's crew is now able to access the 1,014 pounds (460 kilograms) of cargo that the Dragon spacecraft brought up. But unpacking the capsule in earnest won't begin until Memorial Day (Monday, May 28), NASA officials said.

"Monday and Tuesday are very big cargo days on the space station with regard to Dragon," NASA flight director Holly Ridings said during a post-docking briefing Friday. "At least one of the crewmembers will be doing cargo operations almost all of their work days those days." [SpaceX's Dragon Arrives at Space Station (Pictures)]

Six spaceflyers are currently living aboard the station: NASA astronauts Don Pettit and Joe Acaba, European astronaut Andre Kuipers, and Russian cosmonauts Oleg Kononenko, Gennady Padalka and Sergei Revin.

Pettit, Acaba and Kuipers will handle most of the unloading operations, which should take a total of about 25 hours, Ridings said. Dragon's cargo consists primarily of food and clothing for the station astronauts, as well as 15 student science experiments.

"There's about as much stuff in here as I can put in the back of my pickup truck and don't think there will be any issue with the three of us working and getting this thing unloaded over the next two or three days," Pettit told reporters Saturday.

SpaceX holds a $1.6 billion contract with NASA to make 12 supply runs to the space station. Dragon's current mission is a demonstration flight to see if the capsule and SpaceX's Falcon 9 rocket are ready to start the bona fide cargo deliveries.

If all goes well, the first of the 12 contracted missions could launch in September, NASA officials said.

Dragon is slated to stay docked to the orbiting lab until Thursday (May 31), when it will detach and return to Earth with about 1,400 pounds (635 kg) of used gear from the station. The capsule is scheduled to depart and splash down in the Pacific Ocean off the California coast, where SpaceX personnel plan to retrieve it with a recovery ship.

The six station astronauts have been busy for a while preparing for Dragon's arrival, but they'll get a chance to relax for at least part of the holiday weekend, Ridings said.

"We are going to give our crew some time off," Ridings said. "They've been working very hard over the last couple of days, so they'll have a little bit of time off over the weekend."

SPACE.com staff writer Denise Chow contributed to this story. You can follow SPACE.com senior writer Mike Wall on Twitter: @michaeldwall. Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook.

Copyright 2012 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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Sunday, May 27, 2012

Memorial Day Skywatching: See the Half Moon Pass Mars

Monday evening bring us a first quarter moon, offering U.S. skywatchers a chance to close out the Memorial Day holiday with a lunar treat and the fading planet Mars.

The first quarter moon is also sometimes called the "half" moon, although as darkness falls across North America close inspection with binoculars or a small telescope may reveal that there is actually a little more than half of the moon illuminated by the sun. That's because the actual moment of first quarter occurred earlier in the afternoon at 4:16 p.m. EDT or 1:16 p.m. PDT (2016 GMT). 

When it gets sufficiently dark you'll also take notice of a rather bright yellow-orange star appearing well above and a bit to the moon's left. That’s not a star, however, but a once brilliant planet that continues to ebb in brightness: Mars. Look for this colorful world shining high in the southwest during dusk and lower in the west-southwest as night grows late.

Mars will remain prominent all evening, despite the fact that it will continue to slowly fade in the days and weeks to come as it gradually pulls away from the Earth. When the moon passes it by on Monday, it will still be shining at a respectable magnitude +0.5, which is just a trifle dimmer than the ruddy star Betelgeuse in Orion. [Amazing Pictures of Mars]

Astronomers measure the brightness of objects in the sky on a magnitude scale. The lower an object's magnitude number, the brighter it appears in the night sky. Small digits and negative number magnitudes denote the brightest night sky objects.

By the end of June, Mars will have faded fourth-tenths of a magnitude, to +0.9 (remember the higher the number, the fainter the object), making it just a bit brighter than Spica, the brightest star in the Virgo constellation. By that time its position will be about midway between Spica and the planet Saturn to its east and the bluish 1st-magnitude star Regulus in Leo to its west.  

But Mars will then be edging toward Spica and Saturn and will have a striking interaction with those two objects later in the summer.

On June 21, Mars will leave the boundaries of Leo, where it has resided since the beginning of February, and moves into Virgo. On the North American evening of June 28, Mars will pass just 15 arc minutes – 0.25 degrees – south of the 3.8-magnitude star, Beta Virginis. To get an idea of how close that is, that’s one-half the apparent width of the moon. 

Because Mars soon comes to eastern quadrature – a point in the sky that is 90 degrees east of the sun – on June 7, it should now appear distinctly gibbous in even a very small telescope. Most amateur telescopes won’t be showing any substantial detail on Mars; in fact by the end of June its apparent diameter will have shrunk to 6.6 arc seconds, which is less than half the size Mars appeared to us in early March when it was closest to earth at 62.6 million miles (100.7 million kilometers) away.  In contrast, by Jun. 30, Mars will have receded to a distance of 131.8 million miles (212.1 million km) from us.

But at least we have a spacecraft heading for the Red Planet that is drawing near! 

The Mars Science Laboratory, which launched in November 2011, is carrying the 1-ton Curiosity rover which is scheduled to land on the Martian surface early on Aug. 6 to begin a two-year prime mission. Curiosity's landing site is near the base of a mountain inside Gale Crater, near the Martian equator. Researchers plan to use Curiosity to study layers in the mountain that hold evidence about wet environments of early Mars. 

Editor's note: If you snap an amazing picture of the moon and Mars that you'd like to be considered for use in a story or gallery, please send images and comments to SPACE.com managing editor Tariq Malik at tmalik@space.com.

Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy for The New York Times and other publications, and he is also an on-camera meteorologist for News 12 Westchester, New York.

Copyright 2012 SPACE.com, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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