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The origins of Covid
To find out where a virus comes from, researchers compare it to other viruses to try to trace its origin. This leads to claims like SARS-CoV-2 is 91 or even 96% similar to other known viruses. But what does that really mean? Tim Harford talks to the virus ecologist Marilyn J Roossinck.
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Explore how numbers shape, and sometimes mislead us, with The Open University.
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BBC Ideas discovers three easy ways to help make sense of statistics.
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Tim Harford explains the numbers and statistics used in everyday life.
