When a person is left-handed, all it means is that they can do certain things better with the left side of their body than with the right. You may have noticed that some people write with their left hand instead of their right, and that they hold their knife in their left hand, and other similar things. This is not …

Diabetics are people who suffer from diabetes. The main kind of diabetes affects the pancreas, which is gland that produces a hormone called insulin. This hormone controls the amount of sugar in the blood, which provides the energy for the body. In diabetes, insufficient insulin is produced and the sugar level is uncontrolled, resulting in illness. Diabetes usually cannot be …

Some metals are chromium plated to make them look more attractive and to prevent them from corroding or rusting. Chromium is a silver white, hard, brittle metal which was discovered in 1798 by N.L. Vauquelin. Its non-corrosive, high strength, heat resistant characteristics are utilized in alloys and as an electroplated coating. In electroplating, the article to be plated is connected …

Provided it has not been heated, a metal object normally feels quite cold. Something made of wood feels less chilly and cloth doesn’t feel cold at all. Yet all these objects have the same temperature! The reasons is that your fingertips are warmer than the objects. Heat therefore flows into the metal from your fingertips, sharply lowering their temperature, so …

The gravitational pull of each planet basically tries to pull everything within its field toward the planet’s centre, including the planet’s own mass. As all areas of a planet are being pulled equally toward the centre, the planet takes a spherical shape, with all points on the surface being more or less equally distant from the centre.

Only the metals iron, nickel, cobalt and some of their alloys can be made into strong magnets. However, an electric current also gives a strong magnetic field when if flows through a coil. The Earth has magnetic field too, probably because of electric currents circulation in its core. There is a connection here. The atoms of which all substances are …

When it rains, the outer soil of the earth absorbs it. Some water is evaporated and some is absorbed by roots of the trees and plants. The remaining part of the water goes downward due to gravitation. It goes as far below as the openings and cracks of rocks will permit. There is a zone below the surface of the …

Regular scheduled voyages on a set route on the sea are called ‘line voyages’ and vessels (passenger or cargo) trading on these routes to a timetable are called liners. In older usage, ‘liner’ also referred to ships of the line, that is, line-of-battle ships, but that usage is now rare. Today, the term refers to a ship that is constructed …

Ice-skate blades are made of steel for three reasons. First, because steel is immensely strong, hard and resistant to wear. Second, because it is a relatively low conductor of heat. And third, because it can be sharpened to a keen edge. A skate blade has to resist tremendous pressure because it is hollow-ground, so that only the edges rest on …

In the earliest days of life on Earth, hands helped man when he stood or walked about. They were used much as an ape uses them now. If we put our hands on a table as if about to walks on the tips of our fingers, we can see what a well-balanced support is formed. We no longer need our …