Boris Johnson is expected to announce changes to the UK lockdown rules this afternoon, including new social distancing guidelines.
It is expected the two-metre rule will be cut - possibly to a "one metre plus" rule, which will allow people closer together if they're taking protective measures such as wearing a mask.
But just how effective would social distancing of less than two metres actually be in practice? The simple answer is that the further you are from someone who is infected, the lower your risk of catching the virus.
However, advice around the world varies hugely, with the World Health Organisation simply recommending keeping a distance of one metre.
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