_photochemical-smog-how-it-happens-ozone-nitric-acid-aldehydes-peroxyacyl-nitrates-pans-preview-1.jpg "Photochemical Smog: How it Happens? Ozone, Nitric Acid, Aldehydes, Peroxyacyl Nitrates (PANs) from photochemical smog occurs in Video Screenshot Preview 1")
Gallery_photochemical-smog-how-it-happens-ozone-nitric-acid-aldehydes-peroxyacyl-nitrates-pans-preview-3.jpg "Photochemical Smog: How it Happens? Ozone, Nitric Acid, Aldehydes, Peroxyacyl Nitrates (PANs) from photochemical smog occurs in Video Screenshot Preview 3")
Gallery_photochemical-smog-how-it-happens-ozone-nitric-acid-aldehydes-peroxyacyl-nitrates-pans-preview-hqdefault.jpg "Photochemical Smog: How it Happens? Ozone, Nitric Acid, Aldehydes, Peroxyacyl Nitrates (PANs) from photochemical smog occurs in Video Screenshot Preview hqdefault")
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Examrace (UPSC, NET, NCERT, ICSE ...)
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![The top 30 simple things that make us smile include a kind gesture from a stranger, waking up on a sunny morning – and seeing an elderly couple holding hands.<br/><br/>A study of 2,000 adults found seeing a loved one get good news, receiving a surprise gift and getting a hug also feature on the list.<br/><br/>While others experience the same joy after getting into bed with freshly washed sheets, seeing an old friend and watching a puppy.<br/><br/>But for 46 per cent of people, simply having someone smile at you makes you feel happy, with 65 per cent of adults saying that it improves their mood.<br/><br/>That positive boost lasts for an average of more than 13 minutes, leaving them more likely to be kinder to others (37 per cent), more motivated (19 per cent) or make a bold decision (nine per cent).<br/><br/>Bupa Dental Care [https://www.bupa.co.uk/dental/dental-care] commissioned the research as part of National Smile Month, to highlight the benefits the friendly gesture can have.<br/><br/>However, an experiment saw just 21 per cent of adults return the friendly gesture from a stranger.<br/><br/>During a two-hour period, actress Zara Naeem smiled at 112 different people as they walked past her - 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