Countries of the world rely heavily on petroleum, coal and natural gas for their energy sources. There are two major types of energy sources: renewable and non-renewable. Hydro-carbon or fossil fuels are non-renewable sources of energy. Reliance on them poses real big problems. First, fossil fuels such as oil, coal, gas, etc. are finite energy resources and the world eventually will run out of them. Secondly, they will become too expensive in the coming decades and too damaging for the environment. Thirdly, fossil fuels have direct polluting impacts on earth's environment causing global warming. In contrast, renewable energy sources such as, wind and solar energy are constantly and naturally replenished and never run out. Most renewable energy comes either directly or indirectly from the sun. Sunlight or solar energy can be used for heating and lighting homes, for generating electricity and for other commercial and industrial uses. The sun's heat drives the wind and this wind...
Zahir Raihan was one of the most talented film makers in Bangladesh. He was born on 19 August 1935 in the village Majupur in Feni district. He was an active worker of the Language Movement. He was one of the ten students to go out in a procession on 21 February 1952 despite a ban on such activities imposed by the authorities. As a result, he and many others were arrested and taken to prison. Raihan was also present at the historical meeting of Amtala on 21 February 1952. He also took part in the mass movement in 1969. In 1971, he joined the Liberation War. All through his life, Zahir Raihan dreamt of a democratic society, a society that would ensure freedom of speech. He had many dreams about our film industry too. He made a legendary film Jibon Theke Neya based on the Language Movement of 1952. It was a protest against the autocratic government then ruling our country. The family portrayed in that film symbolically represented East Pakistan. The family was ruled by an autocrat who h...