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SARS-CoV-2 infection but not vaccination appear to protect against common cold coronaviruses.
Lowering the nicotine concentration in vapes can lead to users taking longer, bigger puffs, increasing exposure to other toxic substances in the vapes in the short term | The study found reducing from 5% nicotine to 3% or 2.4%, their puffing time, duration and total inhaled volume were larger.
Palaeontologists have described a new genus and species of deep-snouted tyrannosaurid dinosaur named Asiatyrannus xui from the Upper Cretaceous Ganzhou City of southeastern China.
Strong COVID-19 restrictions likely saved lives in the US and the death toll higher if more states didn't impose these restrictions. Mask requirements and vaccine mandates were linked to lower rates of excess deaths. School closings likely provided minimal benefit while imposing substantial cost.
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