We need robots for dangerous, repetitive and high-precision work.
Robots perform tasks in hostile environments that are impossible for humans.
They also carry out repetitious tasks with speed and accuracy.
Without robots, our modern industrialized world would not be possible.
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Jana Gana Mana
Currencies have different values because the values are determined by the forces of demand and supply which varies between countries. If there are more buyers than sellers of a certain currency, its value goes up. The reason behind more buyers may be good economy and development of the country.
Democracy is considered the best form of government because it improves the quality of decision making, enhances the dignity of citizens and it is an accountable form of government.
Chlorine is used to disinfect water because chlorine chemicals are very effective against bacteria, viruses and fungi that contaminate water. The process of adding chlorine to water is called water chlorination.