what is
3. Why is nylon used for making bristles of toothbrushes?
4. What is 5-R principle?
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An equation derived by the twentieth-century physicist Albert Einstein, in which E represents units of energy, m represents units of mass, and c2 is the speed of light squared, or multiplied by itself.
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3. Nylon is a synthetic fiber (the first ever invented, actually) that is strong and flexible. It doesn't degrade, or break down, in water or with the types of ingredients usually found in toothpaste, which makes for a toothbrush with a longer usable life.
4. It is necessary to adopt/focus on 5R principles (Reduce, Reprocess, Reuse, Recycle and Recover) of waste management for sustainable development. Port generates four types of wastes i.e., municipal solid waste, industrial waste, bio-medical waste and e-waste
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