1810 Discovery of a Mass of Native Iron & Luminescent, Poisonous Plant in Brasil

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 Mornay then recounts his examination of a botanical curiosity...

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Unrelated to this post, below is an example of

eclectic science esoterica 

A transparent plastic block is sitting on a table with a square pattern; the back and the bottom of the block are covered with 2" squares. What is the index of refraction of the plastic?

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