Science & Mathematics Questions & Answers

मंगल हमारे सौरमंडल में सूर्य से चौथा ग्रह है। यह केवल बुध से बड़ा है। वैज्ञानिकों का मानना है कि मंगल ग्रह पर पानी (मुख्य रूप से बर्फ के रूप में) मौजूद है। मगल ग्रह लाल क्यों है? यह ग्रह अपने अनोखे रंग के कारण शुरू से ही इंसानों के लिए आकर्षण का विषय रहा है। अपने जंग लगे रंग …

आग लगना कभी भी और कहीं भी हो सकता है। ऐसे में यदि हमें यह पता हो कि आग बुझाने में कौन-सी गैस काम आती है, तो हम समय रहते बड़ी दुर्घटनाओं से बच सकते हैं। कई बार लोग आग पर पानी डाल देते हैं, जबकि हर आग पानी से नहीं बुझती। आग बुझाने में कौन-सी ‘गैस’ काम आती है? …

What is sanskrit? Sanskrit is the name given to ancient classical language of the Hindu inhabitants of India. It was introduced into India probably about 1500 B.C. and was for a time the spoken language as well as the literary language. The sacred Hindu books – the Vedas – were written in Old Sanskrit, but the name really apply only …

Why are Cancer and AIDS so feared? Cancer and AIDS are two of the most dreaded diseases. They are not highly infectious diseases like the plagues of centuries past, so that people who are with sufferers are not necessarily at risk. But they can be difficult to treat, and there is little hope for patients who have either disease in …

The human heart is a remarkable organ. Although it is only about the size of a clenched first, the heart is perhaps the strongest organ in the body, and is certainly one of the hardest workers. How does the heart work? The heart is made up of four chambers, the left and right auricles and the left and right ventricles. …

Why is a holiday in the mountains generally good for the health? The pure air at high altitudes is less rich in oxygen than air at sea level. Because the air gets lighter the higher you climb, you quickly get out of breath when you go mountain-climbing if you not used to it. Why is a holiday in the mountains …

Where does tobacco come from? 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’ – …

What is the law of parsimony? This principle states that the explanation of any phenomenon should make as few assumptions as possible, eliminating those that make no difference in the observable predictions of the explanatory hypothesis or theory. The principle is often expressed in Latin as the Lex Parsimoniae (law of parsimony or law of succinctness). This is often paraphrased …

Who were the Pilgrim Fathers? In Tudor times a number of Puritans lived in Lincolnshire in England, where they were often badly treated because of their faith. At last they could stand the situation no longer. They decided to sail for Holland where other Puritans had already settled. Living in Amsterdam to start with, they moved to Leyden where they …

Why do we eat turkey for Thanksgiving? Although juicy and tender butterball turkeys are the main cuisine of today’s Thanksgiving celebrations, these birds were NOT the most popular centerpieces on the first Thanksgiving tables. In 1621 when the Plymouth* colonists and Wampanoag Indians celebrated the first Thanksgiving, they were gobbling up many more foods than just turkey. Since lobster, goose, …