THE WORLD AROUND US-1

THE WORLD AROUND US - I

What is wind energy ?

India is the fifth-largest wind energy generator in the world and the potential for wind energy in India is around 45,000 MW (Mega Watt). It is expected that 10% (10,000 MW) of the proposed addition in energy of 1,00,000 MW in the next ten years would come from the renewable energy sector and more, predominantly, from the wind energy sector. Wind power has come of age and the next 20 years will see greater and enhanced deployment of wind electric generators as a clean and green source of power generation in India and other Asian countries. Against adding some 500 MW per year we should be looking at capacity additions of at least 2,000 to 3,000 per year.

When were coins invented ?

Before money came into use, trading was done by barter -- exchange of goods or services. As the years passed, people began to use various objects as money -- blocks of salt, glass beads, claws of wild boar and bears, animals, shells and axes of stone and gave each object a certain value. Between 1100 and 500BC merchandise of this type gradually changed to proper coins -- round shaped and minted from metals such as electrum, silver and gold. The first to mint silver coins with a value corresponding to the weight were the Greeks, but the use of coins soon spread throughout the Mediterranean. The word 'money' began in Rome in the 3rd century BC because the mint, the place where coins were stamped out, developed in the suburbs of the temple of Giunone Moneta.

Why do bodies need bones ?

Bones provide a strong framework that supports the rest of the body, Without bones, you would flop on the floor like an octopus! Some of the bones form a suit of internal armour, which protects the brain, the lungs, the heart, and other vital organs. All the bones together are called skeleton. You can move and bend different parts of the body because the bones meet at joints.