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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But, according to the Met Office, if global temperatures rise by more than 2C (above pre-industrial levels) this would increase to nine days.
There’s a nice gradual curve where you use progressively more complicated features as the scope of your project increases.