Carl Sagan’s diagram of spacetime, from the Library of Congress archive of his papers. Complement with Sagan on science as a tool of democracy and his timeless Baloney Detection Kit for critical thinking.
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Among illustrated love letters, thank-you notes, and other epistolary treasures of great artists is this utterly heartwarming gem from design legend Yves Saint Laurent, sent to his dear friend and Vogue art director Alexander Liberman. The letter is drawn inside a sketch of a traditional Islamic cloak typically worn by women in Marrakech, where the designer had a home, against a background of a traditional Moroccan pattern.
My very very dear Alex
I am here, in Marrakech
and I am thinking of you as always
of your friendship, loyalty
and your sincerity
I hope to see you as soon as possible and hug you
I love you with all my heart
Yves
See more of these treasures from the Smithsonian archives here.

