Sperm whales produce a black, smelly substance called ambergris which changes to a pleasant smell when exposed to air. It is rare and expensive but is used as a base in some perfumes. Ambergris also has a folk reputation as a soothing odour for nervous complaints and inhaling ambergis based products is believed by some to increase brain function. Judging by how much these people shell out for ambergris based products, if anything, it seems to impair brain function.
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