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Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008.
Hydrogen is the lightest element on the periodic table.

In 1901, the American inventor King Camp Gillette, with the assistance of William Nickerson, patented a new variation of safety razor with disposable blades.

The waxy covering on plant leaves, young stems, and fruit is called the “cuticle”. It is composed of cutin, a wax-like material produced by the plant that is chemically a hydroxy fatty acid. The purpose of this covering is to help the plant retain water.
Directly underneath the cuticle is a layer of cells called the epidermis.

Grape brandy is distilled from the mash, juice or wine of grapes.

The coconut tree is a member of the palm tree family and the only living species of the genus Cocos.
The term “coconut” can refer to the whole coconut palm, the seed, or the fruit, which botanically is a drupe, not a nut.

Dengue is spread through the bite of the female mosquito (Aedes aegypti).

The Doppler effect is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.

Alkaline earth elements are any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table.

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

Soaps are water-soluble sodium or potassium salts of fatty acids. Soaps are made from fats and oils, or their fatty acids, by treating them chemically with a strong alkali.

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