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Venus is so bright because its thick clouds reflect most of the sunlight that reaches it (about 70%) back into space, and because it is the closest planet to Earth.
Venus can often be seen within a few hours after sunset or before sunrise as the brightest object in the sky (other than the moon).

Swine influenza is an infection caused by any one of several types of swine influenza viruses. Swine influenza virus (SIV) or swine-origin influenza virus (S-OIV) is any strain of the influenza family of viruses that is endemic in pigs. As of 2009, the known SIV strains include influenza C and the subtypes of influenza A known as H1N1, H1N2, H2N1, H3N1, H3N2, and H2N3.

Ptyalin is the strach hydrolysing enzyme secreted by salivary glands in human beings. It is also called as salivary amylase. Ptyalin secreted in the mouth brings about digestion of starch in the mouth itself.

When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. When iron rusts, its weight is increased due to the increased weight of oxygen which has combined with the iron.

Goiter is a condition in which the thyroid gland becomes enlarged.
The thyroid gland is a butterfly-shaped gland that is located in the neck.
It produces hormones that are essential for many bodily functions, including growth, development, and metabolism.
Iodine is a mineral that is essential for the production of thyroid hormones.

The order of the planets, starting nearest the sun and working outward through the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
Mercury is the smallest planet in the Solar System.
Mercury and Venus have no moons. Mars has 2 moons and Earth has one moon.

Meningitis is an acute inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges.The most common symptoms are fever, headache, and neck stiffness. Other symptoms include confusion or altered consciousness, vomiting, and an inability to tolerate light or loud noises.

Diphtheria is a serious bacterial infection that usually affects the mucous membranes of the nose and throat.
Pathogen that cause diphtheria is Corynebacterium diphtheriae.
The signs and symptoms usually begin 2 to 5 days after a person becomes infected.

Liquid ammonia acts as a refrigerant in ice plants. Evaporation of a liquid needs heat energy. When liquid ammonia vaporizes, it absorbs large quantities of heat without changing its temperature. For these reasons, ammonia is widely used as a refrigerant

Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing.
A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia.
With pneumonia, the air sacs may fill with fluid or pus. The infection can be life-threatening to anyone, particularly infants, children, and people over 65 with underlying lung disease who receive immunosuppressive therapy.

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