Our weekly collection of the happiest stories in the world. This week, a "breakthrough" drug that could slow down Alzheimer's, and the men remaking trees. Plus, solving a puzzle that stumped mathematicians for over 50 years. Show less
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Our weekly collection of the happiest stories in the world. This week, a "breakthrough" drug that could slow down Alzheimer's, and the men remaking trees. Plus, solving a puzzle that stumped mathematicians for over 50 years. Show less