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...ht=1.5|People socially distancing while [[queuing]] to enter a supermarket in London during the [[COVID-19 pandemic]]]] ...tainment explains subexponential growth in recent confirmed COVID-19 cases in China |journal=Science |date=15 May 2020 |volume=368 |issue=6492 |pages=742 ...

...[https://books.google.com/books?id=whc4AAAAMAAJ&pg=PT5 digitized version] in [[Google Books]].</ref>]] ...radiation]], radioactive substances such as [[radon]] and [[radium]] found in the environment, and the potential health hazards of non-ionizing radiation ...