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    - Accuracy 8
    - Precision 27
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- Chemistry
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    - States of Matter 202
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    - Ionic Equilibrium 50
    - Solutions 10
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    - Periodic Table 231
    - Chemical Bonding 112
    - Coordination Compounds 23
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    - Halogens 10
    - Noble Gases 5
    - Acids and Bases 74
    - Salt Analysis 28
  - Organic Chemistry
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    - Structural Isomerism 13
    - Nomenclature 83
    - Hydrocarbons 6
    - Haloalkanes 6
    - Alcohols 10
    - Aldehydes 3
    - Ketones 4
    - Carboxylic Acids 9
    - Amines 3
    - Organic Biomolecules 17
    - Organic Reactions 15
  - Analytical Chemistry
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    - Quantitative Analysis 5
    - Titrations 3
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    - Chromatography 5
    - Spectrophotometry 3
    - Electroanalytical Methods 10
    - Mass Spectrometry 5
    - Thermal Analysis 2
    - Separation Techniques 24
  - Biochemistry
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    - Bio Carbohydrates 22
    - Proteins 31
    - Enzymes 24
    - Lipids 49
    - Nucleic Acids 8
    - Metabolism 4
    - Bioenergetics 1
    - Vitamins 35
    - Hormones 17
    - Cell Signaling 16
    - Genetic Code 4
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    - Air Pollution 18
    - Water Pollution 20
    - Soil Pollution 4
    - Waste Management 54
    - Ozone Depletion 9
    - Acid Rain 8
    - Eutrophication 2
    - Toxicology 52
    - Radioactive Pollution 3
  - Industrial Chemistry
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    - Glass 1
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    - Dyes 2
    - Paints 1
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    - Food Chemistry 13
    - Pulp and Paper 2
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    - Detergents 6
  - Nuclear Chemistry
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    - Chemistry Nuclear Reactions 2
    - Radioisotopes 8
    - Nuclear Safety 51
  - Polymer Chemistry
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    - Condensation Polymers 1
    - Natural Polymers 1
    - Synthetic Polymers 2
    - Thermoplastics 3
    - Polymer Properties 1
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  - Theoretical Chemistry
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    - Computational Chemistry 1
    - Statistical Mechanics 12
    - Chemical Thermodynamics 13
    - Reaction Dynamics 125
    - Electronic Structure 57
    - Molecular Dynamics 18
    - Spectroscopy Theory 1
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    - Pharmacokinetics 42
    - Pharmacodynamics 19
    - Drug Metabolism 7
    - Enzyme Inhibition 26
    - Receptor Binding 12
    - Structure Activity 11
    - Prodrugs 5
    - Natural Products 19
    - Peptidomimetics 4
  - Green Chemistry
    - Principles 8
    - Sustainable Design 1
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    - Energy Efficiency 13
    - Catalysis 1
    - Biodegradable Materials 1
    - Green Synthesis 1
    - Solvent Reduction 10
    - Atom Economy 2
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  - Materials Chemistry
    - Crystal Structure 51
    - Band Theory 7
    - Materials Polymers 2
    - Ceramics 5
    - Composites 2
    - Nanomaterials 9
    - Biomaterials 3
    - Corrosion 28
    - Alloys 11
    - Superconductors 1
    - Thin Films 1
    - Magnetic Materials 4
    - Optical Materials 4
- Biology
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    - Prokaryotic Cells 17
    - Eukaryotic Cells 26
    - Cell Organelles 63
    - Cell Membrane 70
    - Cell Wall 2
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    - Ribosomes 13
    - Endoplasmic Reticulum 2
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    - Cytoskeleton 12
    - Cell Division 113
    - Cell Cycle 37
    - Transport Mechanisms 93
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    - Transcription 8
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    - Non Mendelian Inheritance 87
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    - Epigenetics 5
  - Evolution
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    - Theories of Evolution 13
    - Natural Selection 42
    - Variation 27
    - Adaptation 23
    - Speciation 9
    - Fossil Record 12
    - Comparative Anatomy 31
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    - Coevolution 6
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    - Biomes 10
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    - Food Chains 98
    - Food Webs 45
    - Ecological Energy Flow 24
    - Nutrient Cycles 57
    - Biodiversity 183
    - Ecological Conservation 95
    - Habitat 119
    - Succession 24
    - Ecological Adaptation 38
    - Human Impact 37
    - Ecological Climate Change 16
  - Human Anatomy and Physiology
    - Skeletal System 252
    - Muscular System 161
    - Nervous System 340
    - Endocrine System 186
    - Circulatory System 207
    - Respiratory System 177
    - Digestive System 128
    - Excretory System 73
    - Reproductive System 139
    - Immune System 99
    - Integumentary System 51
    - Sensory Organs 213
  - Botany Plant Biology
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    - Plant Reproduction 32
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    - Plant Taxonomy 93
    - Plant Ecology 32
    - Plant Pathology 12
    - Economic Botany 49
    - Seed Biology 6
    - Plant Genetics 5
    - Plant Adaptations 53
  - Zoology Animal Biology
    - Classification 267
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    - Cnidaria 21
    - Platyhelminthes 34
    - Nematoda 17
    - Annelida 16
    - Arthropoda 26
    - Mollusca 16
    - Echinodermata 19
    - Chordata 13
    - Fish 27
    - Amphibians 28
    - Reptiles 41
    - Birds 61
    - Mammals 38
    - Anatomy 30
    - Physiology 29
    - Reproduction 40
    - Development 16
    - Behavior 170
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    - Microbial Structure 58
    - Bacteriology 7
    - Virology 18
    - Mycology 23
    - Parasitology 45
    - Microbial Genetics 2
    - Microbial Physiology 15
    - Microbial Ecology 27
    - Pathogenic Microbiology 177
    - Microbial Biotechnology 2
    - Food Microbiology 16
    - Industrial Microbiology 4
    - Environmental Microbiology 2
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    - Recombinant DNA 9
    - Cloning 6
    - PCR 8
    - Gel Electrophoresis 21
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    - Stem Cells 9
    - Bioreactors 5
    - Fermentation 5
    - Bioinformatics 6
    - GMOs 12
    - Proteomics 1
    - Metabolomics 3
  - Molecular Biology
    - Biological Biomolecules 17
    - Carbohydrates 29
    - Biochemical Lipids 2
    - Bio Proteins 12
    - Bio Enzymes 3
    - Bio Nucleic Acids 21
    - Biochemical Vitamins 36
    - Bio Minerals 5
    - Bio Metabolism 47
    - Cellular Respiration 112
    - Nitrogen Metabolism 9
    - Bio Hormones 13
    - Signal Transduction 6
  - Immunology
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    - Adaptive Immunity 12
    - Antigens 11
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    - Lymphatic System 26
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  - Developmental Biology
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    - Fertilization 48
    - Cleavage 20
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    - Organogenesis 25
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    - Aging 30
- Earth and Space Science
  - Geology
    - Minerals 52
    - Rocks 18
    - Geological Rock Cycle 45
    - Plate Tectonics 107
    - Geological Volcanoes 34
    - Geological Earthquakes 22
    - Weathering 14
    - Erosion 35
    - Soil 8
    - Fossils 8
    - Geological Time 23
    - Geomorphology 10
    - Natural Resources 28
  - Meteorology
    - Metrological Atmosphere 12
    - Metrological Weather 52
    - Climate 5
    - Clouds 14
    - Precipitation 2
    - Air Pressure 21
    - Wind 4
    - Storms 8
    - Hurricanes 7
    - Metrological Tornadoes 15
    - Weather Forecasting 7
    - Metrological Climate Change 3
  - Oceanography
    - Ocean Basins 21
    - Waves 6
    - Tides 4
    - Currents 5
    - Marine Life 30
    - Coral Reefs 19
    - Seafloor Spreading 8
    - Salinity 7
    - Marine Resources 14
    - Ocean Pollution 9
    - Climate Impact 6
  - Environmental Geoscience
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    - Resource Management 4
    - Renewable Energy 76
    - Sustainability 41
    - Conservation 37
    - Land Use 6
  - Paleontology
    - Fossilization 6
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    - Stratigraphy 13
    - Extinction Events 17
    - Evolutionary Trends 16
    - Vertebrate Fossils 12
    - Invertebrate Fossils 7
    - Plant Fossils 3
  - Climate Science
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    - El Nino 12
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  - Hydrology
    - Hydro Water Cycle 5
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    - Evaporation 20
    - Runoff 6
    - Groundwater 5
    - Watersheds 2
    - River Systems 5
    - Lakes 4
    - Wetlands 9
    - Water Quality 27
    - Water Management 22
  - Natural Disasters
    - Earthquakes 6
    - Volcanoes 7
    - Tsunamis 10
    - Floods 6
    - Droughts 1
    - Cyclones 8
    - Tornadoes 4
    - Landslides 3
    - Avalanches 2
    - Wildfires 12
    - Heatwaves 3
    - Blizzards 1
  - Earth Systems and Cycles
    - Geosphere 4
    - Hydrosphere 3
    - Atmosphere 11
    - Biosphere 5
    - Rock Cycle 15
    - Earthy Water Cycle 9
    - Carbon Cycle 5
    - Nitrogen Cycle 14
    - Energy Flow 5
    - Climate System 3
  - Soil Science
    - Soil Formation 3
    - Soil Profile 16
    - Soil Properties 4
    - Soil Fertility 14
    - Soil Physics 1
    - Soil Biology 3
    - Soil Erosion 4
    - Soil Conservation 4
- Astronomy
  - Observational Astronomy
    - History of Astronomy 17
    - Ultraviolet Astronomy 2
    - X ray Astronomy 1
  - Solar System
    - Sun 3
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    - Venus 5
    - Earth 2
    - Moon 21
    - Mars 3
    - Jupiter 2
    - Saturn 14
    - Uranus 5
    - Neptune 7
    - Asteroids 14
    - Comets 10
    - Meteoroids 5
    - Kuiper Belt 2
  - Stars and Stellar Evolution
    - Star Formation 1
    - Main Sequence 10
    - Red Giants 2
    - Black Holes 5
    - Stellar Nucleosynthesis 2
    - Variable Stars 2
  - Galaxies
    - Nebulae 1
    - Quasars 4
    - Galaxy Black Holes 2
  - Cosmology
    - Big Bang 22
    - Cosmo Dark Matter 2
    - Dark Energy 1
    - Cosmic Microwave 3
    - Large Scale 1
    - Galaxy Formation 5
    - Universe Expansion 2
    - Cosmological Models 4
  - Exoplanets
    - Detection Methods 1
    - Planet Types 6
    - Atmospheres 1
  - Astrobiology
    - Extremophiles 1
    - Habitable Zones 1
    - Biosignatures 4
    - Life Detection 2
    - Mars Life 3
    - Space Missions 5
  - Astronomical Instruments
    - Radio Telescope 2
    - Space Telescope 2
    - Photometer 4
    - Planetarium 1
    - Sextant 4
  - Space Exploration and Missions
    - Spacecraft 3
    - Satellites 4
    - Space Probes 3
    - Space Telescopes 1
    - Manned Missions 2
    - Lunar Missions 6
    - Mars Missions 2
    - Space Stations 3
    - Space Agencies 3
  - Celestial Mechanics and Orbits
    - Orbital Motion 7
    - Kepler Laws 3
    - Newton Laws 60
    - Orbital Gravity 1
    - Eclipses 7
    - Retrograde Motion 3
    - Perturbations 5
    - Orbital Resonance 5

Astro Radio Astronomy Quizzes, Questions & Answers

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Test Your Carl Sagan Day Knowledge: How Much Do you Know?

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Sample Question
What is Carl Sagan's most famous book?

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What does Interplanetary Medium fill?

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