Subject
Chemical elements
4
Chemistry, Physical and theoretical
4
Discoveries in science History
4
Inorganic compounds
4
Organic compounds
4
Physics History
4
Quantum theory
4
Air pollution
1
Biology Study and teaching
1
Climatic changes
1
Conservation of natural resources Waste disposal
1
Diagnosis
1
Ecosystem management
1
Ethics
1
Medicine Research
1
Medicine, Preventive
1
Philosophy
1
Physics Study and teaching
1
Refuse and refuse disposal
1
Toxicology
1
Water Pollution
1