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Once a jewel has been damaged, it is near impossible to restore and therefore drastically reduces its value. Ironically, if an antique jewel has a highly valuable stone, it has to be removed from its setting to ascertain its weight and be analysed by a gemmological laboratory, a process that can affect the overall integrity of the jewel

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Research on DIY Air Cleaners to Reduce Wildfire Smoke Indoors On this page: Study Overview EPA Particle Removal Findings DIY Air Cleaner to Reduce Wildfire Smoke Indoors Infographics Underwriters Laboratories Safety Findings Frequently Asked Questions Related Resources Read the Science Matters Newsletter story - Do-It-Yourself Air Cleaners: Making Cleaner Air More Accessible Key Messages Do-It-Yourself (DIY) air cleaners, made with a box fan and MERV 13 air filter, are a cost-effective method for reducing smoke concentrations

It brought me back to the early 80s and going out to bars and smoking when I was 16 years old - there were clouds and clouds of smoke