Science & Mathematics Questions & Answers

Originally, it was thought that the centre of the earth has magnetized iron deposits, which caused it to act like a huge permanent bar magnet. However, the theory failed to explain how the magnetic field had sustained itself for long, because even if there was magnetized iron in the core earlier, the core of the earth is so hot that …

It is nearest to the sun on about the second or third day in January. The distance varies because it spins round the sun in an elliptical orbit or path. The time when the earth is closest to the sun is called the perihelion. The time when it is farthest away the aphelion comes six months later on the first …

Until quite recently it was thought that there were no abundant life forms on this planet until about 600 million years ago. When we remember that the Earth itself is at least 4500 million years old, it does seem to have taken a very long time before any animals or plants appeared. Then, geologically speaking, they must have developed very …

When will the Oceans of the Earth Overflow? Try this out. Plug the sink and leave the water running. It will lead to a flood in the bathroom and a scolding for letting the water overflow. Since the sink could not hold an unlimited amount of water, it let the water spill out. But even the oceans are enormous bodies …

The abbreviation originated in an effort to separate people qualified to practice medicine from those holding the highest academic degree i.e. doctorate in non-medical subjects. Hence, a physician or surgeon is denoted by Dr, while the holders of academic degrees are known by the initial ‘D’ e.g. DPhil (Philosophy) or DLitt (Literature). In USA, only dentists and veterinary surgeons are …

What does cold blooded mean? Creatures such as mammals have a body temperature which stays roughly the same whatever surroundings they are in. This temperature varies from creature to creature, for example the body temperature of any healthy human is 98.4 degrees Fahrenheit. Some creatures are cold blooded, which means that the body temperature varies according to the animals surrounding. …

Perhaps you already know, which blood group you belong to: A, B, AB, O, Rhesus + Rhesus + (Rhesus Positive), or Rhesus – (Rhesus Negative). But do you know what these letters and signs mean? Although all human blood looks the same when see under a microscope, we do not all have the same type of blood. Some substances, found …

Blood plays vital role in the life of our body. It is a fluid that circulates through the heart and blood vessels, supplying nutritive materials to every part of the body and carrying off waste products. It is colorless fluid, plasma, in which float myriads of corpuscles. There are of three kinds: red, white and platelets. Learn More: Blood is …

A blood donor can give about half a litre of blood. The blood is kept for transfusions to help save people’s lives. The body then makes more blood, but the donor should not give blood again for at least two months. Every year on 14 June, countries around the world celebrate World Blood Donor Day.

The cigarette was the last method of taking tobacco to be developed. Previously it had been smoked in pipes and cigars, inhaled as snuff (in powder form) and chewed. Tobacco itself was brought to Europe and the rest of the world when Columbus discovered America, and it was thought to have marvelous medicinal properties. No one could be said to …