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Solar energy is a term used to identify the electromagnetic radiation emitted by the Sun and intercepted by Earth. It is the world's most abundant source of energy and, unlike fuel sources such as oil, one that will never run out.

mount of solar energy intercepted by Earth is about 170 trillion kW, an amount 5,000 times greater than the total of all other energy inputs

The use of steroids and other performance-enhancing drugs has taken center stage in the media today, and justifiably so

Only the gifted, only the dedicated, only the best will win.

Modern sport is plagued by suspicions that many top athletes resort to drug-taking – doping – to enhance their performance. They use anabolic steroids, human growth hormone, erythropoietin (EPO), beta-blockers, stimulants or diuretics.

Guide Dogs for the Blind provides K-9 Buddies

pets for blind and visually impaired children

pets and prepare children for future use and care of a mobility dog.

An aircraft is a vehicle which is able to fly through the Earth's atmosphere or through any other atmosphere. Rocket vehicles are not aircraft if they are not supported by the surrounding air. All the human activity which surrounds aircraft is called aviation.

Heavier-than-air aircraft must find some way to push air or gas downwards, so that a reaction occurs (by Newton's laws of motion) to push the aircraft upwards. This dynamic movement through the air is the origin of the term aerodyne. There are two ways to produce dynamic upthrust: aerodynamic lift, and powered lift in the form of engine thrust. Aerodynamic lift is the most common, with aeroplanes being kept in the air by the forward movement of wings, and rotorcraft by spinning wing-shaped rotors sometimes called rotary wings. A wing is a flat, horizontal surface, usually shaped in cross-section as an aerofoil. To fly, the wing must move forwards through the air; this movement of air over the aerofoil shape deflects air downward to create an equal and opposite upward force, called lift, according to Newton's third law of motion. A flexible wing is a wing made of fabric or thin sheet material, often stretched over a rigid frame. A kite is tethered to the ground and relies on the speed of the wind over its wings, which may be flexible or rigid, fixed or rotary. With powered lift, the aircraft directs its engine thrust vertically downwards. The initialism VTOL (vertical take off and landing) is applied to aircraft that can take off and land vertically. Most are rotorcraft. Others, such as the Hawker Siddeley Harrier, take off and land vertically using powered lift and transfer to aerodynamic lift in steady flight. Similarly, STOL stands for short take off and landing. Some VTOL aircraft often operate in a short take off/vertical landing regime known as STOVL. A pure rocket is not usually regarded as an aerodyne, because it does not depend on the air for its lift (and can even fly into space), however many aerodynamic lift vehicles have been powered or assisted by rocket motors. Rocket-powered missiles which obtain aerodynamic lift at very high speed due to airflow over their bodies, are a marginal case.

The forerunner of the aeroplane is the kite

theory of learning based upon the idea that all behaviors are acquired through conditioning.

Conditioning occurs through interaction with the environment

behavior can be studied in a systematic and observable manner with no consideration of internal mental states.

Art at this stage of life is something to be done or left alone. Natural development will cease unless a conscious decision is made to improve drawing skills. Students are critically aware of the immaturity of their drawing and are easily discouraged. Lowenfeld's solution is to enlarge their concept of adult art to include non-representational art and art occupations besides painting (architecture, interior design, handcrafts, etc.)

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.

Hong 10

Kim Hong-Yeol

The name Hong 10 comes from using a Korean language homonym and an English language pun. The second syllable of his name, Yeol, has the same pronunciation as the Korean pronunciation for the number ten. Therefore, pronouncing the phrase "Hong 10" in Korean will be the same pronunciation as his real name, Hong-Yeol. However, this nickname is always pronounced in English, so he is referred to as hong-ten regardless of the language context - whether Korean or English or otherwise. The nickname "Hong 10" is also a play on the surfer term "Hang Ten".[4]

well, almost. More often than not, the minimum age requirement for skydiving is 18 years old. However, there are some places that allow 16-year olds to participate in the sport.

First of all, if this is your first time sky diving, you will be given a lecture about the sport that would last for at least 4 hours.