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Presidents
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World languages
Some languages spoken in many parts of the world. These are called world languages. , English is the most common world language. Previously, French was the most popular language in the West. Chinese was used by traders in all of East Asia for centuries. Arabic is common in the Middle East, Northern Africa, and other parts of the world.

Once upon a time, Greek and Latin were spoken by most traders in the Western world. Before then, traders learned the languages of nearby cities. Ancient traders did not travel around the world.

The Egyptians used pictures to write their language. The pictures are called hieroglyphics. This is what they look like:

World health
The World Health Organisation (French: Organisation mondiale de la santé ) is an international organisation for public health. It is part of the United Nations. The World Health Organisation began in 1948. It wants people to be healthy and safe. It studies public health and tells governments and other organisations how to help people become healthy.

The organisation counts the number of people with health problems. These health problems include influenza, HIV infection, and depression. It also counts the number of people who experience other problems. These problems include dirty water, violence, and hunger.

Mental health is also important. People with mental health problems such as depression often die ten years early.

The World Bank is also interested in health. Health affects economic prospects.

Poetry
This poem by John Donne mentions the world:

Her death hath taught us dearly that thou art Corrupt and mortal in thy purest part. Let no man say, the world itself being dead, 'Tis labour lost to have discovered The world's infirmities, since there is none Alive to study this dissection; For there's a kind of world remaining still, Though she which did inanimate and fill The world, be gone... The entire poem can be read at Wikisource.

Shape of this world
This world is not a perfect sphere. It is slightly flattened. This is the mathematical formula for measuring the flatness of a sphere:

$$\begin{align} f&=\frac{a-b}{a}. \end{align}$$

For this world, $f\,\!$ is approximately 0.3%. The Moon is rounder. For the Moon, $f\,\!$ is approximately 0.1%. Jupiter is flatter. For Jupiter, $f\,\!$ is approximately 6.5%.

Local planets
A world is on a planet. There are different types of planets. There are several types of planets in this solar system: These are the planets in this solar system:
 * Terrestrial planets
 * Giant planets
 * Gas giants
 * Ice giants
 * Four terrestrial planets
 * Mercury
 * Venus
 * Earth
 * One satellite, called the Moon
 * Mars
 * Two gas giants
 * Jupiter
 * Four large satellites
 * 63 other satellites
 * Saturn
 * 62 satellites. Some are very small. The largest, called Titan, is larger than the planet Mercury.
 * Seven are large.
 * Two ice giants
 * Uranus
 * Five satellites
 * 22 other satellites
 * Neptune
 * One satellite, called Triton