Coronavirus: How do you vaccinate 7.7 billion people?
Five challenges of distributing a Covid-19 vaccine to billions of people.
from BBC News - World https://ift.tt/3o8y8Jq
from BBC News - World https://ift.tt/3o8y8Jq
Why doesn't Ukraine attack the Russian convoy? And other questions
Correspondents and experts answer questions from readers on the BBC News website from BBC News - World https://ift.tt/hVZx7OQ
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