An 18-year-old mountain climber became the youngest ever to summit the world's highest peaks. The slime in your home could be the key to helping fight climate change – send these scientists a picture. Food insecurity is a problem for some Los Angeles residents, so this nonprofit is crop swapping. A cello-playing robot made musical history. Plus, an 81-year-old makes finishing the New York City Marathon look easy – he shares some tips ahead of Sunday's race.

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