A nano-respiratory filter worth just Rs 10 has been designed to tackle deteriorating air quality in the national capital. (Representative photo: PTI) A nano-respiratory filter worth just Rs 10 has ...
With almost one billion people lacking access to clean, safe drinking water, scientists are reporting development and successful initial tests of an inexpensive new filtering technology that kills up ...
A Neutral Density filter, also called an 'ND' for short, is a filter that acts a bit like sunglasses for your lens and comes in different strengths to block out varying amounts of light from hitting ...
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