Khan Academy
Khan Academy: Division and Composition
Test your knowledge of the distinction between the fallacy of division and the fallacy of composition.
Khan Academy
Khan Academy: Denying the Antecedent and Affirming the Consequent
Test your knowledge of the fallacies of denying the antecedent and affirming the consequent.
Khan Academy
Khan Academy: Begging the Question
Test your knowledge of the fallacy of begging the question.
Khan Academy
Khan Academy: Complexity and the Future
Will our descendants enjoy lives that are richer, more fulfilled, healthier, and in general better than those of today? Or will human societies collapse under the strain of depleted resources, brutal conflicts, and environmental damage?...
Khan Academy
Khan Academy: Darwin, Evolution, and Faith
Can ancient scriptural accounts of the world's creation by God be reconciled with Darwin's new story? This article looks at three responses to this question: Conflict, Contrast, and Convergence.
Khan Academy
Khan Academy: Crick, Watson, and Franklin
This article describes the race to unlock the mystery of life by determining the double helix structure of the DNA molecule. The discovery of DNA and its structure is an example of collective learning.
Khan Academy
Khan Academy: Activity: The Voyage of the Beagle
In this activity, you'll learn how to interpret images and maps in order to extract information about Darwin's trip to the Galapagos Islands. Links provided for a gallery of images and a worksheet.
Khan Academy
Khan Academy: The Industial Revolution
At one time, humans, fueled by the animals and plants they ate and the wood they burned, or aided by their domesticated animals, provided most of the energy in use. All life operated within the fairly immediate flow of energy from the...
Khan Academy
Khan Academy: The Anthropocene
What kind of evidence could demonstrate that humans have begun to dominate and alter the life systems of Earth and have entered a new geological epoch? This article discusses the suggestion that we have entered the Anthropocene and...
Khan Academy
Khan Academy: Energy Through Time
The quest for energy has always been a balancing act. As humans have gained greater control over their environment, they've found abundant resources - and faced numerous challenges. This article traces the history of our quest for energy.
Khan Academy
Khan Academy: Smith, Marx, and Keynes
Spanning three centuries of history, from the dawn of the industrial age to modern times, three diverse thinkers developed their own landmark theories on commerce, labor, and the global economy. The three economists profiled in this...
Khan Academy
Khan Academy: Jericho
The history of Jericho is rich and complex, punctuated with the same parade of triumphs and tragedies that so many other ancient cities have experienced. But Jericho's status as the most ancient city on Earth makes it unique. This...
Khan Academy
Khan Academy: Greco Roman
Instead of rule by a single person, Athens and Rome developed governments with widespread participation by male elites, which lasted about 170 years in Athens and about 480 years in Rome. This article discusses the rise of the Greek and...
Khan Academy
Khan Academy: East Asia
The complex and powerful states, dynasties, and civilizations that emerged in East Asia were strongly influenced by the environments in which they prospered. This article discusses the geographic features of China, Korea, and Japan.
Khan Academy
Khan Academy: Conditional Reasoning and Logical Equivalence
How do we recognize logically equivalent conditional statements? Conditional (or "if-then") statements can be difficult to master, but your confidence and fluency on the LSAT will improve significantly if you can recognize the various...
Khan Academy
Khan Academy: Human Embryogenesis
Explains what happens during embryogenesis, the first eight weeks of pregnancy.
Khan Academy
Khan Academy: Innate Immunity
The human body requires a multilayered immune system to keep it running smoothly. The two main classes of the immune system are the innate immune system and the adaptive immune system, or "acquired immunity". This article discusses the...
Khan Academy
Khan Academy: Neuron Action Potentials: The Creation of a Brain Signal
Explains how neurons work during the formation and transmission of brain signals.
Khan Academy
Khan Academy: Phagocytosis
Have you ever wondered how a virus or other infectious agent invades a cell to start an infection? Some objects, like viruses, bacteria, or other particles are too large to transport through the plasma membrane. So, cells engulf the...
Khan Academy
Khan Academy: Test Prep: Mcat: Biomolecules: Enzyme Structure and Function
Enzymes create the conditions needed for biochemical reactions to happen fast. The general name that chemists use for a chemical entity that increases the speed of a reaction is a "catalyst." Enzymes are biological catalysts - they...
Khan Academy
Khan Academy: Test Prep: Mcat: Chemical Processes: Covalent Bonds: Intramolecular and Intermolecular Forces
Explains what intramolecular and intermolecular forces are and the different types for each. Includes lots of examples.
Khan Academy
Khan Academy: Test Prep: Mcat: Chemical Processes: Stereochemistry: Chiral Drugs
Explains the concept of chirality and how it is applied in the development of pharmaceuticals.
Khan Academy
Khan Academy: Test Prep: Mcat: Chemical Processes: Separations and Purifications: Principles of Chromatography
Explains what chromatography is and how its principles are applied when separating mixtures.
Khan Academy
Khan Academy: Single and Multiple Covalent Bonds
Explains what covalent bonds are and the difference between them and ionic bonds. Discusses the properties of polar and non-polar covalent bonds, and single and multiple covalent bonds, and gives analogies and examples of how covalent...