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Science / Science Videos
949 Videos
8 Concepts
The Five Major Geographical Regions in AP World History
2.3K
Diseases Caused by Protists
15K
A Comparison of Early River Valley Civilizations
4.6K
The Basics of Pet Health Insurance
2.1K
Hardy Weinberg Equilibrium: Definition, Equation & Evolutionary Agents
9.3K
Mendel's First Law & Its Application
3.8K
Chemical Kinetics, Reaction Rate Constant & Equilibrium Constant
4.6K
Collision Theory: Definition & Significance
12K
Heat Transfer & Phase Changes
7.9K
Mechanical Equivalent of Heat
1.3K
The Relationship Between Free Energy and the Equilibrium Constant
38K
Rivers' Impact on Early Civilizations
24K
The World at 2014: Events, Issues & Major Trends
856
Newton's Law of Gravitation: Definition & Examples
18K
Agriculture in Ancient Egypt & Mesopotamia
25K
Conflict in the Balkans: Causes & Events
6.6K
Mirrors: Difference Between Plane & Spherical
16K
Uniform Circular Motion: Definition & Mathematics
24K
Thin Lens Equation: Examples & Questions
6.2K
Dipoles & Dipole Moments: Molecule Polarity
52K
Single-Displacement Reaction: Definition & Examples
221K
Lewis Dot Structures: Resonance
11K
Protein Synthesis in Cells: Process & Importance
26K
Substrate-level Phosphorylation and Oxidative Phosphorylation
92K
The Cell: Structure & Function
23K
Oxidation & Reduction Reactions in the Metabolism: Process & Significance
30K
Absorption of Micronutrients and Water into the Bloodstream
16K
How Fiber is Digested by the Body
15K
Using the Scientific Method in the Nutrition Field
9K
How to Find Sources of Reliable Nutrition Information
8K
How Energy-Containing Molecules Support Physical Activity
4.4K
Manganese: Deficiency & Toxicity Symptoms
4.8K
Post-war Latin American Politics
1.1K
Geography and Climate: Effects on Civilizations
53K
Lipids: Types & Nutritional Role
11K
Standardization and Norms of Psychological Tests
18K
Techniques to Study the Brain and Behavior
24K
How Amino Acids Form Protein
49K
Primary Functions of Protein in the Body
85K
Protein Turnover & Balance
9.2K
Proteins: Food Sources & Recommended Intakes
4.1K
Human Sexual Anatomy & Physiology: Major Features & Functions
29K
Biological Influences on Human Behavior: Genetics & Environment
63K
Types of Genetic Disorders: Definitions & Symptoms
14K
Important Respiratory Diseases: Obstructive, Restrictive & Infective
2.8K
Immune Deficiency Diseases: Definitions & Types
4.9K
Pathogens and Disease: Definitions, Types & Causes
91K
Sexually Transmitted Infections: Types, Transmission, Symptoms & Treatments
7.2K
Sources of Health Information: Overview & Reliability
4.5K
Theories of Aging: Rate-of-Living, Cellular & Programmed-Cell-Death
7.4K
Human Longevity: The Influence of Genetic & Environmental Factors
7.6K
What is a Decomposer? - Definition & Examples
112K
What is Respiration? - Definition, Process & Equation
413K
Colloids: Definition, Types & Examples
218K
Linear Momentum: Definition, Equation, and Examples
150K
Cross-sectional, Longitudinal & Sequential Designs: Advantages & Disadvantages
115K
Major Plates of the Lithosphere: Earth's Tectonic Plates
156K
How Observational & Field Research Are Used to Collect Data
7.4K
Power: Definition and Mathematics
10K
Mass and Weight: Differences and Calculations
61K
Work: Definition, Characteristics, and Examples
104K
Net Force: Definition and Calculations
59K
Force: Definition and Types
187K
Real Gases: Using the Van der Waals Equation
25K
Drawing Conclusions Based on Internal Validity
3.6K
Limits to Generalization of a Research Study
5.5K
Interpreting a Non-Significant Outcome
9.2K
Probability Sampling Methods: Multistage, Multiphase, and Cluster Samples
42K
Multivariate Experimental Design
5.5K
Interactions in Factorial Design
6.5K
Main Effects in Factorial Design
8.6K
Ethnographic Design: Definition, Advantages & Disadvantages
42K
An Overview of Qualitative Research
16K
Probability Sampling Methods: Definition & Types
104K
Non-Probability Sampling Methods: Definition & Types
82K
Case Study Design: Definition, Advantages & Disadvantages
95K
How to Determine Sample Size
12K
Grounded Theory Design: Definition, Advantages & Disadvantages
33K
Phenomenological Design: Definition, Advantages & Limitations
96K
Issues in Probability & Non-Probability Sampling
13K
What is Qualitative Research? - Definition, Sources & Examples
153K
What is Sampling in Research? - Definition, Methods & Importance
394K
The Relationship Between Population, Sample & Generalizability
22K
Historical Research Design: Definition, Advantages & Limitations
141K
Anabolism and Catabolism: Definitions & Examples
363K
Using ANOVA to Analyze Variances Between Multiple Groups
12K
What Are t-Tests? - Assessing Statistical Differences Between Groups
16K
Statistical Significance: Definition, Levels & Critical Regions
31K
Frequency Distributions: Definition & Types
9.4K
What is a Chi-Square Test? - Definition & Example
139K
Mean, Median & Mode: Measures of Central Tendency
34K
Hypothesis Testing: Comparing the Null & Alternative Hypothesis
53K
One-Tailed Vs. Two-Tailed Tests: Differences & Examples
204K
Measures of Variability: Range, Variance & Standard Deviation
105K
What Are Descriptive Statistics? - Definition and Uses
48K
Reactivity of Experimental Arrangements & Assessment: Threats to External Validity
4.7K
Metamorphism of Rocks: Definition, Process & Influencing Factors
59K
Sediment: Definition, Types & Features
22K
Contact Metamorphism Vs. Regional Metamorphism: Definition & Differences
100K
Detrital & Chemical Sedimentary Rocks: Definition & Differences
85K
Determining the Origin of a Sedimentary Rock
12K
Classification of Metamorphic Rocks: Texture & Parent
23K
Lithification of Sediments: Definition & Processes
37K
Advantages & Disadvantages of Various Experimental Designs
26K
Small n Designs: ABA & Multiple-Baseline Designs
18K
Within-Subject Designs: Definition, Types & Examples
44K
Methods for Increasing External Validity
8.7K
Random Assignment in Research: Definition and Importance
6.7K
What is External Validity in Research? - Definition & Examples
106K
Between-Subjects Designs: Definition & Examples
55K
Two-Group Experimental Designs: Definition & Examples
41K
Multiple Group Design: Definition & Examples
14K
Generalization & External Validity
4.8K
Threats to External Validity: Sample Characteristics, Stimulus Characteristics & Experimental Arrangements
11K
Matched-Group Design: Definition & Examples
30K
What is a Control Group? - Definition and Use in Research
80K
Factorial Design Variations
6.7K
What is Factorial Design? - Definition & Example
88K
Carryover Effects & How They Can Be Controlled Through Counterbalancing
14K
Requirements of External Validity: Internal Validity & Replication
9.7K
How Novelty Effects, Test Sensitization & Measurement Timing Can Threaten External Validity
4.8K
Threats to Internal Validity III: Selection, Maturation & Selection Interaction
11K
The Effect of Ice Age Glaciers: Formation of Pluvial Lakes
18K
Glacier Movement: Definition & Process
25K
Glacial Deposition: Definition & Results
34K
The Effect of Accumulation & Wastage on Glacier Formation
5.9K
Glacial Erosion: Definition, Processes & Features
125K
Causes of Glaciation
9.2K
The Formation of Stream Valleys
20K
Base Level of a Stream: Definition & Effect on Erosion
21K
Alluvial Channels: Definition & Types
10K
Drainage Basins: Definition & Characteristics
53K
Laminar & Turbulent Streamflows
6.8K
Bedrock Channels: Formation & Process
6.3K
Soil Erosion: Effects & Prevention
187K
Wells: Definition & Types
17K
Environmental Problems Associated With Groundwater
31K
Rock Deformation: Causes and Types
30K
Interactions of Earth's Spheres: Purpose and Examples
158K
Springs: Definition, Formation & Types
42K
Earth's Internal Layers: Crust, Mantle & Core
301K
The Processes of Mountain Building
40K
Factors that Influence Groundwater Movement
28K
Geological Folds: Definition, Causes & Types
91K
Groundwater System: Definition & Geological Role
22K
How Scientists Study Earth's Interior Structure
136K
Geological Faults: Definition, Causes & Types
87K
The Four Spheres of Earth: Geosphere, Hydrosphere, Biosphere, and Atmosphere
601K
Caverns & Sinkholes: Definition, Formation & Effects
22K
Determination of Sex and Identical vs. Fraternal Twins
21K
The Genetic Code: Influence of Mitosis, Meiosis & Crossing Over
15K
Types of Measurement: Direct, Indirect & Constructs
15K
Types of Tests: Norm-Referenced vs. Criterion-Referenced
115K
Mass Wasting: Definition, Types, Causes & Processes
128K
Types of Wasting: Slump, Rockslide, Debris Flow & Earthflow
38K
Major Triggers for Mass Wasting: Water, Slopes, Vegetation Removal & Earthquakes
21K
Threats to Internal Validity I: History, Instrumentation & Subject Mortality
10K
Methods for Improving Measurement Reliability
36K
Physical Variables that Affect Internal Validity
4.7K
Researcher Variables that Affect Internal Validity
4K
The Importance of Measurement in the Research Process
42K
The Reliability of Measurement: Definition, Importance & Types
22K
The Validity of Measurement: Definition, Importance & Types
66K
The Difference Between Qualitative & Quantitative Measurement
209K
Participant Variables that Affect Internal Validity
5.9K
What is Internal Validity in Research? - Definition & Examples
176K
Conceptualization & Operationalization in Measurement
26K
Controlling for Extraneous Variables: Single Blind, Double Blind & Placebo Methods
28K
Continuous, Discrete & Categorical Variables: Definition and Examples
157K
Commonly Used Research Measurement Scales
10K
Extraneous & Confounding Variables: Differences & Examples
94K
Scales of Measurement: Nominal, Ordinal, Interval & Ratio
326K
The Relationship Between Reliability & Validity
63K
Threats to Internal Validity II: Statistical Regression & Testing
4.9K
The Influence of Single Gene-Pair Inheritance on Development
9.1K
The Influence of Sex-Linked and Polygenic Inheritance on Development
10K
Types of Volcanoes: Shield, Cinder Cones & Composite Cones
622K
Volcanic Landforms: Types & Formation
84K
Volcanic Eruption: Gases Released & Their Effects
59K
What is Chemical Weathering? - Definition, Process & Examples
419K
Factors that Affect the Rate of Weathering
99K
What is Soil? - Definition, Structure & Types
322K
Mechanical Weathering: Definition, Process, Types & Examples
153K
Lava Flow, Pyroclastic Flow, Pyroclastic Surge & Tephra: Preventing Volcanic Hazards
37K
Using the Raw Score Method to Compute the Correlation Coefficient
7.4K
Quasi-Experimental Designs: Definition, Characteristics, Types & Examples
289K
Correlational Research: Definition, Purpose & Examples
425K
Response Styles of Surveys: Types, Advantages & Disadvantages
13K
Pretest-Posttest Design: Definition & Example
94K
Descriptive Research Design: Definition, Examples & Types
704K
Understanding the Time Dimension in Research
10K
Interpreting the Correlation Coefficient
15K
Cross-Sectional Designs: Definition & Examples
35K
Longitudinal Designs: Definition & Examples
63K
Limitations of Correlational Research
33K
Ex Post Facto Designs: Definition & Examples
132K
What is Developmental Research? - Definition, Purpose & Methods
55K
Is Intelligence Genetic? - Genes' Influence on Intellectual Abilities
28K
Is Personality Genetic? - DNA's Influence on Temperament
104K
Genetic Abnormalities in Human Growth and Development
15K
Hurricanes: Categories and Effects
13K
The Importance of Understanding Research Methodology
40K
The Purpose of Descriptive Statistics in Human Growth and Development Research
5.9K
The True Experimental Research Design
16K
Research Designs: Quasi-Experimental, Case Studies & Correlational Research Designs
49K
Using the Richter Scale to Measure Earthquakes
29K
The Structure of the Atmosphere
42K
Major Components of the Atmosphere
47K
The Distribution of Water on Earth
61K
What is an Earthquake? - Definition and Components
125K
Climate Classifications & Their Global Distribution
19K
The Causes of Earthquakes
128K
What is Solar Radiation? - Definition & Effects
73K
Runoff & Infiltration: Definition & Process
32K
Destruction Caused by Earthquakes
41K
Aftershocks & Foreshocks of an Earthquake
18K
Identifying and Understanding Earthquakes Using Seismic Activity
23K
Mechanisms of Heat Transfer: Conduction, Convection & Radiation
207K
Properties of Ocean Water
25K
The Effects of Coastal Erosion on Shoreline Features
38K
Oceanic Ridge System: Formation & Distribution
18K
Using Hard Stabilization on Shorelines
5.8K
Active & Passive Continental Margins
32K
The Causes & Effects of a Tsunami
190K
Ocean Basins: Definition, Formation, Features & Types
100K
What Is a Hurricane? - Definition and Formation
36K
The Effects of Deposition on Shoreline Features
9.8K
Waves: Types, Features & Effect on Erosion
40K
What Are Tides? - Causes & Effects
95K
Types of Marine Organisms
19K
Contributing Factors of Longshore Transport: Beach Drift & Longshore Current
17K
Characteristics of Shorelines & Beaches
14K
Alternatives to Hard Stabilization: Beach Nourishment & Relocation
6.4K
Renewable & Non-Renewable Resources: Definition & Differences
595K
Wind as a Renewable Energy Resource: Advantages & Disadvantages
13K
Hydroelectric Energy: Definition, Uses, Advantages & Disadvantages
88K
Sustainable Consumption: Definition and Complexities
16K
Understanding Voluntary Simplicity as a Form of Sustainable Consumption
3.3K
Environmental Sustainability: Definition and Application
73K
Human Behaviors that Threaten Environmental Sustainability
27K
Sustainable Development within Environmental Limits
13K
Samples & Populations in Research: Definition
63K
Using Content Analysis to Collect Social Research Data
7.2K
Using Experiments to Collect Social Research Data
8K
Using Existing Statistics to Collect Social Research Data
5.1K
The Major Sections of a Research Study According to APA
24K
Inductive vs. Deductive Reasoning: Differences & Examples
168K
Selecting a Problem to Research
13K
Using Archival Research & Secondary Records to Collect Social Research Data
8.8K
The Literature Review Process
17K
Primary & Secondary Research: Definition, Differences & Methods
363K
Writing Research Questions: Purpose & Examples
146K
Formulating the Research Hypothesis and Null Hypothesis
175K
Strategies for Choosing a Data Collection Technique
9.1K
Research Variables: Dependent, Independent, Control, Extraneous & Moderator
479K
How to Choose a Research Method & Design
21K
Using Surveys to Collect Social Research Data
7.6K
Published & Typed Reports: Differences & Examples
2.2K
What Is Chlamydia Trachomatis? - Symptoms, Signs & Treatment
20K
What Is Syphilis? - Causes, Symptoms & Stages
10K
What Is Gonorrhea? - Cause, Symptoms & Cure
7.1K
Weather Variables: Air Pressure, Temperature & Density
123K
Types of Air Masses & Their Effect on Weather
93K
The General Circulation of the Atmosphere
17K
Weather vs. Climate: Definition, Differences & Effects
39K
What Are Cyclones? - Types, Causes & Effects
347K
Understanding Weather Fronts: Types & Their Effect on Weather
46K
What Are Thunderstorms? - Definition, Types & Formation
46K
What Are Tornadoes? - Definition, Causes & The Enhanced Fujita Scale
26K
Future Environmental Concerns: Population, Food Supply, Energy & Pollution
24K
Environmental Worldviews: Western & Deep Ecology
26K
Environmental Ethics & Human Values: Definition & Impact on Environmental Problems
146K
What is Environmental Legislation? - Laws, Regulations & Timeline
47K
Environmental Planning & Decision Making: Definition & Components
16K
The Economics of Pollution: Marginal Cost of Pollution & Optimum Amount of Pollution
29K
Economics, Natural Capital & the Environment
5.3K
What is Environmental Justice? - Definition, Principles, Examples & Issues
54K
What Is Environmental Health? Definition, Types & Sources
62K
Understanding & Assessing Threats to Environmental Health
5.8K
Disease Control & Prevention
9.6K
Preventing Disease: Normal Human Flora
12K
The Differences Between Infection and Disease
46K
Symbiotic Interactions in Disease: Definition, Theory & Examples
7.8K
Establishment of Disease: Entry, Dose & Virulence
4.7K
What Is Bacterial Growth & Generation Time? - Curves, Phases & Stages
160K
Legal and Unethical Behavior in Research
7.7K
Informed Consent in Research with Special Populations
3.8K
Using Animal Subjects in Research: Issues & Considerations
3.2K
Protecting Research Participants: Mandated & Federal Regulations
2.1K
The Importance of Institutional Review Boards in Research
5K
Conducting Research on People: General Guidelines
11K
Risks of Research: Physical Harm, Psychological Abuse & Legal Jeopardy
14K
What Is Informed Consent in Research? - Definition & Purpose
36K
Negating Deception in Research
2.4K
Research Misconduct: Fraud and Plagiarism
3.9K
Ethical Research: Maintaining Privacy, Anonymity & Confidentiality
9.9K
Environmental Toxicants: Types, Sources & Effects
25K
Toxicants and Children: Why Children Are More Susceptible
3.2K
The Stockholm Convention on Persistent Organic Pollutants
3.4K
The Dose-Response Curve: Determining Health Effects of Environmental Pollutants
10K

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