The correct answer is: All of the above
Ernst Chain, who fled Nazi Germany, played a key role in turning penicillin into a widely used antibiotic. Albert Sabin, a refugee from Poland, developed the oral polio vaccine. Selman Waksman, a refugee from Ukraine, led the discovery of streptomycin, the first effective treatment for tuberculosis. With the freedom and resources, they found in the U.S., these refugee scientists have saved countless millions of lives.
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Jan Koum fled Ukraine as a child and grew up in California, relying on food stamps to survive. He later co-founded WhatsApp, one of the most widely used messaging platforms in the world.