In 1942, at the height of British industrial war mobilization, an unlikely cohort scavenged the nation’s coastline for a precious substance. Among them were researchers, lighthouse keepers, members of the Royal Air Force and the Junior Red Cross, plant collectors from the County Herb Committee, Scouts and Sea Scouts, schoolteachers and students. They were looking for fronds and tufts of seaweed containing agar, a complex polysaccharide that forms the rigid cell walls of certain red algae.
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這起事件發生前一週，美國也曾出現類似威脅，導致華盛頓特區肯尼迪（甘迺迪）表演藝術中心被疏散。美國媒體報導指出，該威脅同樣針對在當地演出的神韻藝術團。