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This depends on what your views on science is... The most pressing health scientific issue is finding a cure for cancer that does not affect your blood cells. The most pressing earth science issue is preventing global warming. The most pressing physics issue is to find a theory of everything (unified field theory).
finding the cure for cancer
The cold war
The cold war
The cold war
the cold war
the cold war
Try pressing Ctrl and - at the same time.
Italian emigration helped with the country's financial issues, as well as solving some of the political issue at the same time.
by pressing r&b at the same time deactivate it by pressing l&b at the same time
Between 1776 and 1865
Early and mid-1920s.