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I have read that the eruptionI have read that the eruption of Krakatoa in 1883 caused a change in weather patterns worldwide, causing The Year Without a Summer in the US a few years later. Would this fit your friend's story?

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?