Menu

Interactive STEM Explorer

STEM Surprise

Open each discipline, then drill into refined categories and key terms. Every section is clickable and designed to match your neon dark chemistry theme.

Biology Life, systems, and living processes
Biology studies living systems from molecules to ecosystems. Expand each branch to view focused sub-fields and rapid definitions.
Cell biology themed image Cell Biology

The structure and function of cells, organelles, membranes, and signaling networks.

Membrane Biology

Transport proteins, ion channels, and signaling at cell boundaries.

Organelle Dynamics

How mitochondria, ER, and lysosomes adapt during stress and growth.

Cell Cycle

Regulation of division checkpoints, mitosis, and apoptosis.

  • Homeostasis: Cellular balance of internal conditions.
  • Endocytosis: Uptake of molecules through membrane vesicles.
  • ATP: Main short-term cellular energy carrier.
  • Signal transduction: Converting external cues into cellular responses.
Genetics themed image Genetics

Inheritance, gene expression, mutation, and genomic variation across populations.

Mendelian Genetics

Alleles, dominance patterns, and trait inheritance models.

Molecular Genetics

DNA replication, transcription, translation, and regulation.

Population Genetics

How allele frequencies shift through selection and drift.

  • Gene: DNA segment encoding functional products.
  • Genotype: Genetic makeup of an organism.
  • Phenotype: Observable traits from genes plus environment.
  • Mutation: Stable DNA sequence change.
Microbiology themed image Microbiology

Microorganisms including bacteria, archaea, viruses, fungi, and protists.

Virology

Viral structure, replication, and host interactions.

Bacteriology

Bacterial physiology, metabolism, and pathogenicity.

Immunomicrobiology

Host defenses and microbe immune evasion strategies.

  • Pathogen: A microbe capable of causing disease.
  • Biofilm: Surface-attached microbial community in matrix.
  • Antibiotic resistance: Reduced susceptibility to antimicrobial drugs.
  • Horizontal gene transfer: DNA exchange between unrelated cells.
Anatomy and physiology themed image Anatomy & Physiology

Body structure and function from tissues and organs to complete systems.

Organ Systems

Cardiovascular, respiratory, nervous, and endocrine integration.

Tissue Biology

Epithelial, connective, muscle, and neural tissue behavior.

Human Physiology

Feedback control of metabolism, pH, temperature, and circulation.

  • Hemostasis: Physiological process that stops bleeding.
  • Action potential: Rapid electrical signal in excitable cells.
  • Endocrine signaling: Hormones acting through blood circulation.
  • Perfusion: Delivery of blood to tissues.
Botany themed image Botany

Plant structure, growth, physiology, adaptation, and ecological role.

Plant Physiology

Photosynthesis, transpiration, and nutrient transport.

Plant Development

Meristems, flowering signals, and growth hormones.

Plant Ecology

Adaptation to climate, soils, and community interactions.

  • Chloroplast: Organelle where photosynthesis occurs.
  • Xylem: Conductive tissue carrying water upward.
  • Phloem: Tissue transporting sugars and metabolites.
  • Photoperiodism: Growth response to day-length changes.
Zoology themed image Zoology

Animal behavior, anatomy, ecology, evolution, and taxonomy.

Comparative Anatomy

Structural similarities and differences across animal groups.

Ethology

Natural behavior, communication, and social systems.

Marine Zoology

Ocean biodiversity and adaptation in aquatic environments.

  • Niche: Functional role of a species in ecosystems.
  • Trophic level: Position in food-energy transfer chains.
  • Camouflage: Adaptation reducing detection by predators or prey.
  • Speciation: Formation of new species over time.
Ecology themed image Ecology

Interactions among organisms, populations, communities, and environmental systems.

Population Ecology

Population growth models, carrying capacity, and density effects.

Community Ecology

Species interactions including competition, predation, and mutualism.

Ecosystem Ecology

Energy flow and nutrient cycling across trophic layers.

  • Carrying capacity: Maximum sustainable population size in a habitat.
  • Biodiversity: Variety of genes, species, and ecosystems.
  • Biogeochemical cycle: Movement of elements through living and nonliving reservoirs.
  • Ecological resilience: Ability to recover after disturbance.
Neuroscience themed image Neuroscience

Neural structure, signaling, circuits, and cognition from cells to behavior.

Cellular Neurobiology

Neurons, glia, synapses, and action-potential physiology.

Systems Neuroscience

How brain networks drive sensory processing and movement.

Cognitive Neuroscience

Neural basis of memory, attention, language, and decision-making.

  • Synapse: Junction where neurons communicate chemically or electrically.
  • Neurotransmitter: Signaling molecule released at synapses.
  • Plasticity: Long-term change in neural connectivity and strength.
  • Myelination: Axonal insulation that speeds signal conduction.
Chemistry Matter, reactions, energy, and molecular design
Chemistry explains how substances are built, transformed, measured, and engineered. Expand branches for practical categories and key terms.
Organic chemistry themed image Organic Chemistry

Carbon-based molecules, functional groups, mechanisms, and synthesis.

Reaction Mechanisms

Stepwise pathways showing bond-making and bond-breaking events.

Stereochemistry

3D molecular arrangement and chirality-dependent behavior.

Synthetic Strategy

Route planning for efficient target molecule construction.

  • Functional group: Atom pattern governing reactivity.
  • Nucleophile: Electron-pair donor attacking positive centers.
  • Electrophile: Electron-poor site that accepts electron pairs.
  • Isomer: Same formula, different structure or arrangement.
Inorganic chemistry themed image Inorganic Chemistry

Metals, minerals, coordination complexes, and non-carbon frameworks.

Coordination Chemistry

Metal-ligand bonding and complex geometry.

Solid-State Chemistry

Crystalline materials, defects, and electronic behavior.

Bioinorganic

Roles of metals in enzymes and biological systems.

  • Ligand: Ion or molecule bound to central metal.
  • Oxidation state: Electron accounting number for atoms.
  • Crystal lattice: Ordered 3D repeating atomic arrangement.
  • Coordination number: Count of atoms directly bonded to center.
Physical chemistry themed image Physical Chemistry

Thermodynamics, kinetics, quantum behavior, and molecular energetics.

Thermodynamics

Energy, entropy, spontaneity, and equilibrium limits.

Chemical Kinetics

Reaction rates and mechanisms through rate laws.

Quantum Chemistry

Electronic structure and bonding from wave models.

  • Enthalpy: Heat content at constant pressure.
  • Entropy: Distribution/dispersion of energy states.
  • Activation energy: Barrier that reactants must overcome.
  • Equilibrium constant: Ratio describing reaction composition at equilibrium.
Analytical chemistry themed image Analytical Chemistry

Techniques to identify, separate, and quantify chemical components.

Spectroscopy

Interaction of matter with electromagnetic radiation.

Chromatography

Separation based on phase affinity and mobility.

Electroanalysis

Quantification using electrical and electrochemical signals.

  • Calibration curve: Signal-to-concentration reference relationship.
  • Limit of detection: Smallest reliably detectable quantity.
  • Selectivity: Method ability to target analyte in mixtures.
  • Precision: Repeatability of measurement values.
Biochemistry themed image Biochemistry

Chemical processes of life including proteins, enzymes, and metabolism.

Enzymology

Rate enhancement, active sites, and catalytic mechanisms.

Metabolic Pathways

Linked reaction networks for energy and biosynthesis.

Molecular Signaling

Biochemical communication controlling cellular responses.

  • Enzyme: Biological catalyst accelerating reactions.
  • Substrate: Molecule transformed by an enzyme.
  • Allosteric regulation: Activity modulation at non-active binding sites.
  • Metabolite: Intermediate or product in metabolism.
Environmental chemistry themed image Environmental Chemistry

Chemical behavior in air, water, soils, and pollutant transformation.

Atmospheric Chemistry

Gas-phase reactions, aerosols, and photochemical cycles.

Aquatic Chemistry

Water quality, dissolved species, and contaminant mobility.

Green Chemistry

Safer reagents and lower-waste process design.

  • pH buffering: Resistance to rapid acidity changes.
  • Bioaccumulation: Progressive chemical buildup in organisms.
  • Photolysis: Compound breakdown driven by light.
  • Remediation: Removal or neutralization of contamination.
Materials chemistry themed image Materials Chemistry

Design of polymers, ceramics, composites, and nanomaterials with targeted performance.

Polymer Science

Chain structure, molecular weight, and thermal/mechanical behavior.

Nanomaterials

Size-dependent optical, catalytic, and electronic properties.

Electronic Materials

Semiconductors, conductive films, and energy-storage interfaces.

  • Band gap: Energy difference controlling electronic conduction.
  • Crystallinity: Degree of long-range structural order in materials.
  • Composite: Engineered material combining two or more phases.
  • Surface functionalization: Tailoring surfaces for specific interactions.
Nuclear chemistry themed image Nuclear Chemistry

Radioisotopes, nuclear transformations, decay kinetics, and radiation applications.

Radiochemistry

Chemical handling and behavior of radioactive nuclides.

Nuclear Decay Analysis

Half-life models and decay chains for isotope identification.

Medical Isotopes

Radiotracers and therapeutic radionuclides in diagnostics and treatment.

  • Half-life: Time for half of nuclei in a sample to decay.
  • Isotope: Same element with different neutron count.
  • Alpha/Beta/Gamma radiation: Major nuclear emission types.
  • Dosimetry: Measurement and control of radiation exposure.

Expanded STEM Reference Library

Use this section as a deeper quick-reference. Each card gives concise but higher-detail context, core mechanisms, applications, and high-value vocabulary you can reuse in class, labs, and projects.

Biology: Molecular Foundations

Molecular biology links DNA storage, RNA processing, and protein synthesis into regulated information flow.

  • Central dogma: DNA stores inheritable information, RNA transmits and processes it, proteins execute function.
  • Epigenetics: Gene activity changes through chromatin marks without changing base sequence.
  • Transcriptome: Full RNA expression profile in a specific cell state.
  • Proteostasis: Network that controls folding, trafficking, and degradation of proteins.
  • Post-translational modification: Chemical changes (phosphorylation, acetylation) that tune protein activity.

Biology: Systems Physiology

Systems physiology studies multi-organ integration required for stable internal conditions.

  • Negative feedback: Corrective control loop that stabilizes a variable around set point.
  • Endocrine axis: Hormone cascades coordinating metabolism, stress, and growth.
  • Cardiorespiratory coupling: Oxygen delivery depends on both ventilation and perfusion.
  • Renal regulation: Kidneys balance electrolytes, pH, and osmolarity through selective reabsorption.
  • Allostatic load: Cumulative physiological wear from chronic adaptation to stress.

Biology: Evolution & Population

Evolutionary biology explains trait distribution through mutation, inheritance, and selective pressures over time.

  • Natural selection: Differential reproductive success of heritable phenotypes.
  • Genetic drift: Random allele frequency change strongest in small populations.
  • Gene flow: Migration-mediated allele transfer between populations.
  • Adaptive radiation: Rapid diversification into new ecological niches.
  • Phylogeny: Evolutionary relationship tree built from morphological or molecular data.

Chemistry: Bonding & Structure

Structure-property relationships start with bonding models and electron distribution.

  • Hybridization: Orbital mixing model used to predict geometry and sigma/pi bonding.
  • Resonance: Electron delocalization represented by multiple contributing structures.
  • Intermolecular forces: Hydrogen bonding, dipole interactions, and dispersion control phase behavior.
  • Coordination geometry: Ligand arrangement strongly affects inorganic reactivity and spectra.
  • Crystal field splitting: Orbital energy separation driving color and magnetism in complexes.

Chemistry: Reaction Engineering View

Chemical outcomes depend on both molecular mechanism and process conditions.

  • Rate law: Functional relationship between reaction rate and reactant concentration.
  • Selectivity: Preference for desired product versus side products.
  • Mass transfer limit: Transport bottleneck that can dominate observed rates.
  • Catalyst turnover: Number of substrate molecules transformed per catalytic site.
  • Process intensification: Designing systems for higher efficiency, safety, and reduced waste.

Chemistry: Data Quality & Analysis

Reliable analytical conclusions require validated methods and rigorous uncertainty handling.

  • Accuracy vs precision: Closeness to true value versus repeatability of measurements.
  • Matrix effect: Sample composition altering analytical signal response.
  • Internal standard: Added reference compound correcting variability in prep/instrument response.
  • Method validation: Demonstration of fitness via linearity, range, robustness, and bias checks.
  • Metrological traceability: Link from measurement result to established standards chain.