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Sensitivity of Human Ear. The human ear can respond to minute pressure variations in the air if they are in the audible frequency range, roughly 20 Hz – 20 kHz. It is capable of detecting pressure variations of less than one billionth of atmospheric pressure.

An aphrodisiac is defined as any food or drug that arouses the sexual instinct, induces veneral desire and increases pleasure and performance.

Duralumin is a hard, light alloy of aluminium with copper and other elements.

Methane was discovered and isolated by Alessandro Volta between 1776 and 1778 when studying marsh gas from Lake Maggiore. It is the major component of natural gas, about 87% by volume.

Flame cells – Tapeworm.
Contractile vacuole – Amoeba
Nephridia – Earthworm.

E.O.Wilson – Father of Biodiversity.
William Harvey – Father of Blood circulation.
A.O.Hume -Father of Indian Ornithology.

Blue gold – water, green gold – vanila, White gold – platinum.

Vitamin K is used by the body to help blood clot. Without vitamin K, blood coagulation is seriously impaired, and uncontrolled bleeding occurs.

Biotin also called vitamin B7 and formerly known as vitamin H or coenzyme R.
Biotin is a water-soluble B vitamin.

Vitamin D is a hormone, not a vitamin. The skin is responsible for producing vitamin D. During exposure to sunlight, ultraviolet radiation penetrates into the epidermis and photolyzes provitamin D3 to previtamin D3. Previtamin D3 can either isomerize to vitamin D3 or be photolyzed to lymisterol and tachysterol. Vitamin D is also sensitive to sunlight and is photolyzed to 5,6-transvitamin D3, suprasterol I, and suprasterol II. In Boston, solar irradiation only produces previtamin D3 in the skin

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