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Science
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Physics
Hard👥 9K participated
Chemistry
Hard👥 8K participated
Biology
Medium👥 10K participated
Astronomy
Medium👥 11K participated
Space Missions
Medium👥 6K participated
Human Body
Medium👥 7K participated
Environment
Easy👥 5K participated
Inventions & Discoveries
Medium👥 6K participated
Scientific Research
Hard👥 3K participated