For Proust it was a bite of a buttery madeleine; for some, it's the taste of a gooey Mallomar. And for you, it might be a few notes of "Yellow Submarine" or the sight of a little girl stacking Legos that catapults your mind decades into the past. Under the right conditions, the tiniest trigger can unleash a flood of sunny memories in even the least sentimental among us.
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