1762063693 vuelta al mundo

In a november twobut from 1955, 70 years ago, American researchers Carlton-Schwerdt and Schaffer They obtain the virus that causes poliomyelitis in crystalline form. OTHER ANIMALS 1769.- The Spanish explorer Gaspar de Portolá discovers the Gulf of San Francisco, in California. Around the World Newsletter Francisco Sanz analyzes how internationalContinue Reading