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Why is it that most countries around the world experienced a spike in COVID cases at roughly the same time?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why is it that most countries around the world experienced a spike in COVID cases at roughly the same time?	1
Is it possible to have too many vaccinations?	1
Does our mass increase and become infinite once we reach the speed of light?	1