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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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13:25, 27 февраля 2026Мир
Smoke alarms have been around for many decades. The technology has barely changed in recent years – but is modern life slowly outpacing the capabilities of these life-saving devices?
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Scroll to load interactive demo，更多细节参见搜狗输入法2026
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