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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...

 'Heritage' is what we inherit from the past, live with in the present and then pass on to our children or future generation. Our unique source of life and inspiration is our cultural and natural heritage. When we speak of 'World Heritage', it indicates places and sites that we inherited from the past and pass on to the future generation of the entire world. The 'Shat Gambuj Mosque' in Bagerhat is such a heritage. It became a UNESCO World Heritage Site in 1985. Originally, the historic Mosque City was known as 'Khalifatabad'. It is situated at the outskirts of Bagerhat town—not very far from the dense mangrove forest of the Sundarbans. Khalifatabad was a Muslim colony. It was founded by the Turkish general, a saint warrior Ulugh Khan Jahan in the 15th century. The infrastructure of the city reveals significant technical skills in many mosques as well as early Islamic monuments. Baked bricks were used for the construction of the buildings. The planning ...

21 February is observed as Shaheed Dibosh every year throughout the country in remembrance of the martyrs of language movement of 1952. The commemoration begins at the early hours of the day with mourning songs that recall the supreme sacrifices of our language martyrs. People wear black badges and go to the Shaheed Minar in barefoot processions, singing mourning songs. They place wreaths at the Minar . Many of them visit the graves of the martyrs at Azimpur graveyard and pray for them. They also attend various programmes organised in remembrance of the language martyrs. The UNESCO (United Nations Educational, Scientific and Cultural Organisation) on 17 November in 1999 proclaimed February 21 as the International Mother Language Day in recognition of the sacrifices of the martyrs for the rightful place of Bangla. Two Bangladeshi expatriates living in Vancouver in Canada, Rafiqul Islam and Abdus Salam, sent a proposal to Kofi Anan, the then Secretary General of United Nations. They ...

21 February is a memorable day in our national history. We observe the day every year as International Mother Language Day. The day is a national holiday. On this day, we pay tribute to the martyrs who laid down their lives to establish Bangla as a state language in undivided Pakistan in 1952. The struggle to achieve our language rights is known as the Language Movement. The seed of Language Movement was sown on 21 March 1948 when Mohammad Ali Jinnah, the Governor General of Pakistan, declared in a public meeting in Dhaka that Urdu would be the only state language of Pakistan. The declaration raised a storm of protest all over the country. The protest continued non-stop, gathering momentum day by day. It turned into a movement and reached its climax in 1952. The government outlawed all sorts of public meetings and rallies to stop it. The students of Dhaka University defied the law and brought out a peaceful protest procession on 21 February 1952. When the procession reached near Dha...

Human being can neither change the sun’s radiation nor the earth’s orbit around the sun. But they can control the increase in the amount of greenhouse gases and its effect on the atmosphere. Only during the last hundred years the carbon dioxide concentration has been raised alarmingly in the atmosphere and we humans can be held responsible for this. The main cause of the increase in carbon dioxide level in the atmosphere is the burning of fossil fuels. Since the end of the 19th century, industrial activities increased rapidly giving rise to many factories. These factories required energy, which was produced through the combustion of coal. Besides coal, other sources of energy such as mineral oil and natural gas were also burned to heat our houses, run cars and airplanes or to produce electricity. Nowadays, about 85 million barrels of crude oil are burned daily. Every time a fossil raw material is burned, it releases carbon dioxide into the air. Therefore, it is clear that more and mo...