Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

Where does tobacco come from? QA For Students And Children

Kids Questionnaire - Where does tobacco come from?

Tobacco is the name given to the plant and cured leaves of Nicotiana, and it can be used in various ways – for smoking, chewing and snuffing. It was first cultivated by the Indians of North and South America. Accounts of Christopher Columbus’s first voyage in 1492 speak of the natives of Cuba using ‘smoking reeds’ – a kind of …

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How long has man been walking the Earth?

How long has man been walking the Earth?

Ever since the philosopher and naturalist, Charles Darwin, and his contemporaries including Wallace, suggested that man had evolved from apes, there has been a continuous, and almost frantic quest for evidence of our ancestors. Of course, where we come from has always been a fascinating question, but it is only comparatively recently that systematic searches have been made for traces …

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When water appeared on the Earth?

When water appeared on the Earth?

The first folds in the crust of the Earth took place in complete darkness, when the world still felt very hot. The Earth had cooled sufficiently to harden the rocks but its temperature was still far higher than that of boiling water. No water was to be found on the surface and all the water vapour coming from the burning …

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Why are Chinese calendars based on animals?

Why are Chinese calendars based on animals?

A large percentage of the Chinese are followers of Taoism. According to Taoist belief, the Jade Emperor is the ruler of heaven, mankind and hell. It is said that the Jade Emperor decided to assign a different animal for each year, so that people could easily remember the twelve-year zodiac cycle. So he called one representative from each animal species …

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क्या आप जानते हैं की हम फोन करते हुए Hello ही क्यूं कहते हैं?

Alexander Graham Bell

हम किसी को फोन करने पर हैलो ही क्यों कहते हैं ? हम चाहे फोन रिसीव करें या कॉल करें। हमारा सबसे पहला शब्द होता है Hello! आखिर हम इसी शब्द का इस्तेमाल क्यों करते हैं? अगर ये कहा जाय कि यह किसी का नाम है तो आप सोंच में पड़ जायेंगे। लेकिन हम आपको बता दें की जी हां, यह नाम था वैज्ञानिक ग्राहम बेल की गर्लफ्रेंड का। जिसका पूरा …

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Why scratching an itch is so rewarding!

Areas of the brain involved in motor control and reward processing light up more in chronic itch patients when they scratch, according to a new study which may explain why scratching evokes a pleasurable sensation. Researchers in the Department of Dermatology and Temple Itch Center at Temple University School of Medicine (TUSM) used advanced functional magnetic resonance imaging to look …

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What is talcum powder made of?

What is talcum powder made of?

The main constituent of talcum powder is talc added with some perfume. Talc is chemically known as magnesium silicate, having a distinguishable character of extreme softness. Also called soap stone, talc is the softest mineral (the hardest being diamond). Talcum powder may also contain germicide with a view to effectively neutralise bad odour of perspiration and various perfumes for fragrance. …

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What is the difference between champagne and wine?

What is the difference between champagne and wine?

Wine is made by fermenting grape juice. Champagne is a white sparkling wine strictly from Champagne region in France and is made by re-fermenting wine in bottles and adding yeast to it. Wine re-fermented in bottles anywhere else in the world or aerated by injecting carbon dioxide is called Sparkling Wine and not Champagne Funny Logics Simple, Champagne is for …

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How does wood become termite-resistant?

How does wood become termite-resistant?

Wood is made termite-resistant by treating it with creosote oil, black oil or other wood preservatives. This is applied in large tanks under pressure to make sure it penetrates the wood deeply. Most termites will die if their supply of moisture is cut off. Funny Logics By treating it with pungent chemicals. By ‘woodpeckering’ the termite.

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