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Usain Bolt disqualified; USA 1-2 in decathlon

In a major disappointment to the crowd in Korea, Usain Bolt was disqualified on Sunday with a false start in the 100 meters final at the world championships. Bolt immediately responded to his mistake, removing his jersey after the field was called for the departure.

"Looking for tears?" Bolt asked after the race, according to the Associated Press. "Not going to happen. I'm OK."

His disqualification means that it will not remove the triple gold - gold medals in the relays 100, 200 and 4x100 - he wanted to Korea. Countryman Yohan Blake won gold in 9.92 seconds despite a headwind.4 meters per second. American Walter Dix took silver in 10.08.

American Trey Hardee and Ashton Eaton finished 1-2 in men's decathlon. Hardee, reigning world champion, won gold with a total of 8607. In the last event of the decathlon, Eaton went from bronze to silver, to light in 1500 to win the race in a time of 4:18.94 staff wellness.

Brittney Reese won the American gold medal in the women's long jump, defending his world title. His jump of 22 feet, 4 1 / 2 inches was enough to win but to his personal best of 23 feet 7 1 / 4 inches, which she set at nationals earlier this year.

Ethiopia Ibrahim Jeilan won 10 000 men, one of the exciting final sprint past the British Mo Farah in the last 10 meters. Jeilan won in 27:13.81, just 0.26 seconds ahead of Farah. Galen Rupp was the top American, finishing seventh. Farah, 27, is one of the biggest stars in British leading to the Games next summer in London.

In the women's 400 semifinals, all three American women made the final. Defending world champion Sanya Richards-Ross was not until after all the rounds were finished to see if it had advanced. She finished third in his heat with a time of 50.66.Francene McCorory and Allyson Felix won two of their heats automatically eligible.

Reid Cherner and Tom Weir has been with USA TODAY since 1982 and they wrote Game On! since March 2008.

Reid has covered everything from high school for horse racing in college and the pros. The only thing he loves more than his own voice is the sound of the player telling him when he is right and wrong.

Tom has covered every Summer Olympics and Winter since 1984 and has made numerous trips to the Super Bowl, World Series, Final Four and NBA Finals.In 2009, he put more miles on his bike than his car.

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Of all the minerals mined from the Earth, none is more useful than gold. Its usefulness is derived from a diversity of special properties. Gold conducts electricity, does not tarnish, is very easy to work, can be drawn into wire, can be hammered into thin sheets, alloys with many other metals, can be melted and cast into highly detailed shapes, has a wonderful color and a brilliant luster. Gold is a memorable metal that occupies a special place in the human mind.

Historical uses of gold;

Throughout the history of our planet almost every established culture has used gold to symbolize power, beauty, purity and accomplishment. Today we continue to use gold for our most significant objects: wedding rings, Olympic medals, Oscars, Grammys, money, crucifixes and ecclesiastical art. No other substance of the same rarity holds a more visible and prominent place in our society.

Uses of gold in jewelry making:

The production of ornamental objects was probably the first use of gold over 6000 years ago. Gold is found in the pure state, is very easy to work and was probably the first metal used by humans. Today, most of the gold that is newly mined or recycled is used in the manufacture of jewelry. About 78% of the gold consumed each year is used in the manufacture of jewelry.

Measurement of purity in gold:Purity of

The properties of an attractive metal that is easily worked into beautiful objects. Another extremely important factor that demands the use of gold as a jewelry metal is tradition.

The alloys of gold have a lower value per unit of weight than pure gold. A standard of trade known as “karatage” was developed to designate the gold content of these alloys. Pure gold is known as 24 karat gold and is almost always marked with “24K”. An alloy that is 50% gold by weight is known as 12 karat gold (12/24ths) and is marked with “12K”. An alloy that contains 75% gold by weight is 18 karat (18/24 = 75%) and marked “18K”. In general, high karat jewelry is softer and more resistant to tarnish while low karat jewelry is stronger and less resistant to tarnish – especially when in contact with perspiration.

Alloying of gold with other metals:

Alloying gold with other metals changes the color of the finished products.

An alloy of 75% gold, 16% silver and 9% copper yields yellow gold. White gold is an alloy of 75% gold, 4% silver, 4% copper and 17% palladium. Other alloys yield pink, green, peach and even black colored metals.

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