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20th Century Scientific Advancements

• Gale Science Resource Center
  
• WorldBook Inventions and Discoveries
  
• Biotechnology; Changing Life Through Science

Technology and Earth Science

• Earth's Core
  
• Earth'sInner Core
• Continental Drift Theory

Astronomy

• Gamma-Ray Bursts
• Planets Around Other Stars
• The Universe is Accelerating
• The Big Bang Theory

Chemistry

• Radioactivity
• Plastics
• Isotopes

Evolution

• Australopithecus
• Laetoli Footprints
• Toumai

Genetics

• DNA Polymorphism
• Humans Have 20,000 to 25,000 Genes
• RNA Interferon

Medicine

• Insulin
• Oncogenes
• The Human Retrovirus HIV

Physics

• Superconductors
• Quarks
• Nuclear Forces
• Isotopes in Manufacturing