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History
Science
Discoveries
All Subcategories (15)
Advancements in Earth's Understanding
Architectural Remains
Artifacts
Cave artifacts
Clovis spear points
First discoveries
Historical discoveries
Mastodon extinction and ancient hunters in Washington
Modern period
Natural Resources
Penicillin
Planetary Discovery
Sedna Discovery
Sources of Conflict
Westward Expansion
Parent Categories (24)
Adventure
Archaeology
Archeology
Astronomers
Astronomy
Biology
Curiosity Rover
Current Events
DNA
Exploration
Geography
Geology
History
History and Science
Physicists
Physics
Pre-Columbian art
Prehistoric
Research
Science
Scientific Achievements
Scientific Revolution
Space Exploration
Viking Orbiter Missions