Letter of the Week
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<iframe src=”Mapa-blog-wordpress-professorcas.com260317-htm.html” width=”100%” height=”600″ frameborder=”0″> </iframe>
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https://www.if.ufrgs.br/historia/50anos/sitemap.htm
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https://www.if.ufrgs.br/einstein/sitemap.html
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Escrevendo sobre Planck, Einstein e o início da teoria quântica, acabei de descobrir (4/4/2026) esse pequeno artigo de 1997, publicado na Isis, por Martin J. Klein e Allan Needell. Nesse artigo eles relatam a descoberta que fizeram nos arquivos do Annalen der Physik: em 1906 Einstein resenhou esse importante livro de Planck: Transcrevo os dois…
About the Archivist
This is a curated selection of letters that left a mark on the world, on someone’s life, or just in the margins of time.
Each is transcribed with care and respect for the medium that first carried it: the typewritten page.