For Child of Lir, peaches being poisonous in the world of tWoT is one of the things I did to make the world different. Though peach pits do contain small amounts of cyanide, which was once manufactured through processing peach pits. Several other fruits with pits, such as apricots, also have trace amounts of cyanide in the pits. And almonds may be the first genetically engineered plant since humans bred the deadly, to humans, cyanide levels out them to make them edible for people.
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