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The stakes in Athens are fierce. The difference between an Olympic gold or silver medal could be a one hundredth of a second on the track or in the pool; an inch on the pole vault or shot put.

The athletes who make the Olympic cut are blessed with the right combination of physical and psychological traits, including an intense competitive drive and an unrelenting determination to be the best. This is the stuff of champions.

Steroids are not just for elite athletes--they can be used by anyone who wants to change his or her body image. The Centers for Disease Control's Youth Risk Behavior Surveillance report shows more than a million youth taking steroids, and the numbers have been rising every year.

Scientists made an alarming discovery in the 1980s: The average surface temperature on Earth is slowly increasing. This trend is known as global warming. It is believed to be caused by an increase in the amounts of certain gases in the atmosphere. Greenhouse Effect To understand global warming, it helps to first understand something called the greenhouse effect. A greenhouse is a glass house in which plants grow. The glass lets light in and at the same time keeps heat from getting out. This trapped heat keeps the plants warm even when it is cold outside. Likewise, Earth's atmosphere traps energy from the sun. Carbon dioxide and other gases—called greenhouse gases—in the air do this trapping. Without these gases too much heat would go back into space, and living things could not survive. However, as more greenhouse gases get into the air, they also trap more heat. This leads to global warming.

Other ongoing research by Alcantar's team has shown that the mucilage can also kill bacteria in the water, solving another potential water quality problem.

The mucilage either engulfs the bacteria and starves them, or it binds to the bacteria and causes them to settle out of the water.

Mucilage consists of carbohydrates and sugars.

basic laws of physics dictate that energy is conserved and can only be changed from one form to another or into matter.

Fuel, on the other hand, is the accumulation of matter and therefore represents a store of energy.

released in the form of heat when the fuel is burned in chemical or nuclear reactions

who studies the link between steroid use and aggression, has recently found evidence that use of anabolic steroids may have long-term effects on behavior and aggression levels well after they stop abusing these performance enhancing drugs.

used for scouring arsenic, bacteria and cloudiness out of rural drinking water

There, the residual water from boiling the flat, oval-shaped lobes of prickly pear for salads and other dishes was used to clear up cloudy water drawn from the river before use for cooking or drinking.

Mucilage is the clear, gooey, viscous liquid from within the cactus which helps to seal water inside the plant so it can survive desert-dry conditions.

Remember the rhyme: "Red sky at night, sailor's delight; Red sky at morning, sailors take warning." Look for any sign of red in the sky (not a red sun); it will not be a bold orange or red the majority of the time, but that depends a little on where you live. Sailor's delight If you see a red sky during sunset (when you're looking to the west), there is a high pressure system with dry air that is stirring dust particles in the air, causing the sky to look red. Since prevailing front movements and jet streams weather usually move from west to east (see Tips), the dry air is heading towards you.

Check the grass for dew at sunrise. If the grass is dry, this indicates clouds or strong breezes, which can mean rain. If there's dew, it probably won't rain that day. However, if it rained during the night, this method will not be reliable.

After World War II had ended, Japan was devastated. All the large cities (with the exception of Kyoto), the industries and the transportation networks were severely damaged. A severe shortage of food continued for several years.

The whole operation was mainly carried out by the United States.

Over 500 military officers committed suicide right after Japan surrendered, and many hundreds more were executed for committing war crimes.

Hello everyone. My name is Guillermo Vargas Habacuc. I am 50 years old and an artist. Recently, I have been criticized for my work titled "Eres lo que lees", which features a dog named Nativity. The purpose of the work was not to cause any type of infliction on the poor, innocent creature, but rather to illustrate a point. In my home city of San Jose, Costa Rica, tens of thousands of stray dogs starve and die of illness each year in the streets and no one pays them a second thought. Now, if you publicly display one of these starving creatures, such as the case with Nativity, it creates a backlash that brings out a big of hypocrisy in all of us. Nativity was a very sick creature and would have died in the streets anyway.

end of the spectrum are the reds and oranges. These gradually shade into yellow, green, blue, indigo and violet. The colors have different wavelengths, frequencies, and energies. Violet has the shortest wavelength in the visible spectrum. That means it has the highest frequency and energy. Red has the longest wavelength, and lowest frequency and energy. LIGHT IN THE AIR Light travels through space in a straight line as long as nothing disturbs it. As light moves through the atmosphere, it continues to go straight until it bumps into a bit of dust or a gas molecule. Then what happens to the light depends on its wave length and the size of the thing it hits. Dust particles and water droplets are much larger than the wavelength of visible light. When light hits these large particles, it gets reflected, or bounced off, in different directions. The different colors of light are all reflected by the particle in the same way. The reflected light appears white because it still contains all of the same colors. Gas molecules are smaller than the wavelength of visible light. If light bumps into them, it acts differently. When light hits a gas molecule, some of it may get absorbed. After awhile, the molecule radiates (releases, or gives off) the light in a different direction. The color that is radiated is the same color that was absorbed. The different colors of light are affected differently. All of the co

d after Lord John Rayleigh, an English physicist, who first described it in the 1870's.) WHY IS THE SKY BLUE? The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by t

As you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.