The Nerdiest Christmas Cards Ever May Be These Microscope Slides Composed of Shells
The unusual holiday exchange, which lasted decades during the early 20th-century, hints at the drama between the two colleagues
The Strange Nature of the First Printed Illustration of a Sloth
As described by a 16th-century French missionary, the South American 'little bear' with the face of 'a baby' was introduced to Europe
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