Ravindra Krishnamurthy

Ravindra Krishnamurthy is a freelance science writer covering science, tech, the environment, health, food, and culture.

Wave Carpet – Harnessing Wave Energy

https://www.youtube.com/watch?v=EWnY-XFihVQ Professor Reza Alam and his PhD students in Mechanical Engineering Department, University of California, Berkeley, are testing out a prototype of a device which can produce electricity and provide clean drinking water for coastal communities throughout the world. Called a ‘wave carpet’, it harnesses the predictable wave power to obtain usable energy. As the waves roll through, the carpets motion produces hydraulic pressure energy. This energy can to used […]

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Differences in Tilled and No Till Soils – A Demonstration

In this video agronomist Mark Scarpitti of USDA-NRCS Ohio state demonstrates the differences between tilled and no-till soils by doing two simple tests. Slide test: In this test, a piece of soil is put in water to check how soil structure is held together. When water starts to rush into the porous spaces in the soil, tilled soil starts falling apart as there are nothing to hold the soil particles […]

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Solar Tyre Cooker

Sketch showing the solar tyre cooker With relatively inexpensive materials and easy to construct, a solar tyre cooker can be a very useful device for many of the poor people in the world. In many African countries people walk long distances to collect firewood to cook their food, or spend up to 50% of their income buying wood or charcoal. The materials needed to make this solar oven are very […]

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Will You Eco-Marry Me? (video)

More and more couples world over are resisting large expensive marriages and are embracing the concept of eco-marriage with a conscious effort to reduce their environmental footprint. Watch this video as the eco-conscious Tokyo couple Shigeru Komori and Tomoko Hoshino opt for a low carbon-emitting, socially responsible, energy efficient wedding celebration. Both are passionate about the environment and so practising their eco-philosophy on their wedding day was a true reflection […]

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Zeer Pot: Demonstration of Its Effectiveness

https://www.youtube.com/watch?v=ZNLPeb3qIhc A Zeer Pot – Off Grid Refrigeration (Duration 5:36 minutes) A zeer pot is an ancient device used to cool things. It was invented by the Egyptians about 2500 years before Christ was born. It works on the principle of evaporative cooling. It’s still in use today in North Africa and this video tells you about it and shows you how to make and use one. Interesting notes: More […]

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Sandbar Cropping in Bangladesh

Bangladesh, home for one of the largest deltas in the world, is facing the adverse effects of climate change with riverbank erosion and flood water inundation during the annual monsoon. This has resulted in loss of agriculture crops, livestock and homesteads. The amount of cultivable land is reducing every year in an ever-changing landscape. Sandbar cropping has made a positive impact in converting these unfertile barren sandbars into food producing […]

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Planned Obsolescence – The Foundation of Modern Consumer Society

https://www.youtube.com/watch?v=vfbbF3oxf-E The Light Bulb Conspiracy – Planned Obsolescence (Duration: 53 minutes) ‘Planned obsolescence’ is the deliberate shortening of a product life span so that customers are compelled to buy new products. The sole intention: to make profits. It all started a century ago, when in the late 1920s a group of businessmen came up with a concept — a product that refuses to wear out is a tragedy for business. […]

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Cooking Steaks with Sunlight in South Africa (video)

Using coal and kerosene to fuel a stove is both costly and hazardous. Social entrepreneur Crosby Menzies hopes it will become a thing of the past in Africa. He rolled out his solar cooker, a satellite-dish shaped oven that uses sunlight to cook meals, in the Johannesburg township of Soweto. By employing locals like Mthobisa Cebekhulu, he believes he can bring it to other impoverished parts of the continent.

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Solar Water Bottle Bulbs

Alfredo Moser with his solar water bottle bulbs Introduction Thomas Alva Edison lit up the world with his electric bulb in the nineteenth century. In this century it is the solar bottle bulbs of Alfredo Moser which are illuminating thousands of houses of under-privileged people in many countries. This simple invention of the Brazilian mechanic is going viral and is been implemented in remote villages throughout the world. This article […]

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