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Continue to ChatGallery: How caves give astronauts a preview of life in space https://ideas.ted.com/gallery-how-caves-give-astronauts-a-preview-of-life-in-space/
Gallery: How caves give astronauts a preview of life in space https://ideas.ted.com/gallery-how-caves-give-astronauts-a-preview-of-life-in-space/