{"type": "rich", "version": "1.0", "html": "<iframe src=\"https://quotewise.io/embed/quote/58snf4/\" width=\"600\" height=\"200\" frameborder=\"0\" allowfullscreen title=\"An \"empty world,\" i.e., a homogeneous manifold at all points at which equations (1) are satisfied...\"></iframe>", "width": 600, "height": 200, "title": "An \"empty world,\" i.e., a homogeneous manifold at all points at which equations (1) are satisfied...", "author_name": "Howard P. Robertson", "author_url": "https://quotewise.io/o/Howard_P._Robertson/", "provider_name": "Quotewise", "provider_url": "https://quotewise.io", "thumbnail_url": "https://quotewise.io/og/q/58snf4.png", "thumbnail_width": 1200, "thumbnail_height": 630, "cache_age": 86400}