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This website explains the way conjoined twins form, the mortality rate, the history, and the types

This was more of the same information, but it also discussed the mortality rate of the plant, and it's fairly surprising, as only 1% of the seeds survive to adulthood.

This is a great piece about the invention of gun powder.

Thanks for putting this article out there! I learned about the role of alchemy and the eternal search for immortality. How ironic the invention would lead to such mortality.