{"type":"rich","version":"1.0","author_name":"fry (npub1qr…ezjey)","author_url":"https://nostr.ae/npub1qr277h2lawvgwyvq6hx3cz8kgxg5a3d5zvqn6p6cjn6v3rzsf2aq2ezjey","provider_name":"njump","provider_url":"https://nostr.ae","html":"I'd love to recreate Eratosthenes famous experiment sometime. The one where he was able to (fairly) accurately estimate the circumference of the earth. https://www.scientificamerican.com/article/measure-earths-circumference-with-a-shadow/"}