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How can this year's flu shot only be 10% effective? You'd think it would either be effective or not. Unless there's ten strains of flu and it's only protecting against one.

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How can this year's flu shot only be 10% effective? You'd think it would either be effective or not. Unless there's ten strains of flu and it's only protecting against one.	1
What's going on in my brain when I hear a song that I like and want to play it over and over again?	1