Online courses directory (381)

Rediscover the most important observations in history. Discovery of Magnetism. Compass: which way is north?. Floating Magnet. Compass Build (stroke direction). Compass Build (magnet orientation). Neutralize a Compass. Compass Interactions. Magnetising materials. What's Next?. Magnet near Compass. Tracing a Magnetic Field. Tracing a magnetic field. Discovery of Magnetic Fields. Magnet and iron filings. Magnetic field. 3D magnet with field. Magnetic Permeability. Increase Strength of Magnet. What's Next?. Are 2 magnets stronger than 1?. Measure the Earth!. Earth's Magnetic Field (how to measure). Force over Distance. Inverse Square Law (deflection method). Inverse Square Relationship. Inverse Square Law (Method of Oscillation). Zinc Copper cell (reduction-oxidation). How to Measure?. Battery Meter (Galvanometer). How Many Turns?. Electrolyte Test (pure water vs. vinegar). Reverse Electrodes (polarity). Electrolyte (strong acid test). Electrolyte (salt test). Electrode (distance test). Electrolyte (temperature test). Electrode (surface area test). Standard Cell. How much electrolyte does a single cell need?. What's Next?. Discovery of Electromagnetism. Experiment: Electromangetism. Electromagnetic Field (above vs. below). Electromagnetic Field (forward vs. reverse). Electromagnetic Field (loop). Right-Hand Rule. Battery Meter (Galvanometer). Series Load. Pencil Resistor. Variable Resistor (Pencil). Listen to Variable Resistance. What's Next?. Electromagnet (construction tip). Electromagnet (penny powered). Understanding Force. Spinning Compass. Build your own motor. What's Next. Discovery of Triboelectric effect. Pith Ball Electroscope. Foil Leaf Electroscope. What's Next?. Discovery of Magnetism. Compass: which way is north?. Floating Magnet. Compass Build (stroke direction). Compass Build (magnet orientation). Neutralize a Compass. Compass Interactions. Magnetising materials. What's Next?. Magnet near Compass. Tracing a Magnetic Field. Tracing a magnetic field. Discovery of Magnetic Fields. Magnet and iron filings. Magnetic field. 3D magnet with field. Magnetic Permeability. Increase Strength of Magnet. What's Next?. Are 2 magnets stronger than 1?. Measure the Earth!. Earth's Magnetic Field (how to measure). Force over Distance. Inverse Square Law (deflection method). Inverse Square Relationship. Inverse Square Law (Method of Oscillation). Zinc Copper cell (reduction-oxidation). How to Measure?. Battery Meter (Galvanometer). How Many Turns?. Electrolyte Test (pure water vs. vinegar). Reverse Electrodes (polarity). Electrolyte (strong acid test). Electrolyte (salt test). Electrode (distance test). Electrolyte (temperature test). Electrode (surface area test). Standard Cell. How much electrolyte does a single cell need?. What's Next?. Discovery of Electromagnetism. Experiment: Electromangetism. Electromagnetic Field (above vs. below). Electromagnetic Field (forward vs. reverse). Electromagnetic Field (loop). Right-Hand Rule. Battery Meter (Galvanometer). Series Load. Pencil Resistor. Variable Resistor (Pencil). Listen to Variable Resistance. What's Next?. Electromagnet (construction tip). Electromagnet (penny powered). Understanding Force. Spinning Compass. Build your own motor. What's Next. Discovery of Triboelectric effect. Pith Ball Electroscope. Foil Leaf Electroscope. What's Next?.

1. Bit-zee. 2. Bit-zee (long version). 3. Bit-zee Bot Introduction. 4. Bit-zee planning and propulsion. 5. Bit-zee's bits. 6. Bit-zee's chassis/frame. 7. Bit-zee's wheel mounts and fenders. 8. Bit-zee's component mounting holes. 9. Bit-zee's batteries. 10. Improving the battery wires. 11. Connecting Bit-zee's power wires and on-off switch. 12. Bit-zee's motors. 13. Why does Bit-zee need a motor controller?. 14. Bit-zee's motor controller. 15. Attaching and wiring Bit-zee's motor controller. 16. Attaching Bit-zee's Arduino. 17. How to hotwire a digital camera. 18. Attaching Bit-zee's digital camera. 19. Bit zee's 5 Volt power distribution board. 20. Hacking and attaching a digital recorder/player to Bit-zee. 21. Making a power connector for the Arduino. 22. Attaching Bit-zee's prototype board. 23. Connecting the motor controller to the Arduino. 24. Connecting Bit-zee's camera to the Arduino. 25. Bit-zee's bumper switches. 26. Bit-zee's eyes. 27. Bit-zee's IR sensor. 28. Bit-zee's shell. 29. Camera wiring update.

Humans have been making art for tens of thousands of years, long before there was writing. Why was Egyptian art obsessed with death? Why did the ancient Greeks seek the perfect human form? How did the ancient Romans use art as state propaganda? Why was the naturalism of ancient Greek and Roman art abandoned with the rise of Christianity? This topic explores the art of the ancient world, from the Venus of Willendorf to a 6th-Century Chinese Bodhisattva. Prehistoric Art: Paleolithic Origins. Nude Woman (Venus of Willendorf). The Neolithic Revolution. Jade Cong. Prehistory: Proto-writing. Prehistoric Art Quiz. Introduction. Ancient History: The Alphabet. Sumerian Art: Standard of Ur. Sumerian Art: Great Lyre from the "King's Grave" at Ur. Akkadian Art: Victory Stele of Naram-Sin. Babylonian Art: Law Code Stele of King Hammurabi. Ashurbanipal Hunting Lions (Assyrian). Assyrian Art: Human Headed Winged Lion and Bull (Lamassu). Neo-Babylonian Art: Ishtar Gate and Processional Way. Ancient Near Eastern Art. Introduction. Egyptian Art. Materials & Techniques. Ancient Near Eastern & Ancient Egyptian Art. Old Kingdom: Seated Scribe. New Kingdom: House Altar with Akhenaten, Nefertiti and Three Daughters. Portrait Head of Queen Tiye with a Crown of Two Feathers. New Kingdom: Thutmose's Bust of Nefertiti. Judgement in the Presence of Osiris, Hunefer's Book of the Dead. New Kingdom: Ramesses II. Ptolemaic: Rosetta Stone. Ancient Egypt. Ancient Greece and Rome. Ancient Greek and Roman Art. Geometric: Terracotta Krater. Archaic: Exekias, Attic black figure amphora with Ajax and Achilles playing a game. Archaic: Exekias, Dionysos Kylix, c. 530 B.C.E.. Archaic: Mixing Vessel with Odysseus Escaping from the Cyclops's Cave. Archaic: New York Kouros. The Classical Orders. Archaic and Early Classical: Ancient Greek Temples at Paestum, Italy. Archaic and Early Classical: East and West Pediments, Temple of Aphaia, Aegina. Early Classical: Polykleitos, Doryphoros (Spear-Bearer). Classical: Myron, Discobolus (Discus Thrower), Roman copy of an ancient Greek bronze. Classical: Parthenon Frieze. Classical: Sculpture from the Parthenon's East Pediment. Classical: Parthenon Metopes. Classical: Caryatid and Column from the Erechtheion. Late Classical: Lysippos, Farnese Hercules, 4th century B.C.E. (later Roman copy by Glycon). Late Classical: Lysippos, Apoxyomenos (Scraper), c. 330 B.C.E. (Roman copy). Late Classical: After Praxiteles, Venus (Roman Copy). Hellenistic: Barberini Faun. Hellenistic: Dying Gaul. Hellenistic: Nike of Samothrace. Hellenistic: The Pergamon Altar. Hellenistic: Apollonius, Boxer at Rest. Hellenistic: Alexander Mosaic. Hellenistic: Laoco

Brushed DC motor explained. Build your own motor. Compare the hair dryer motor to the one you can build.

What makes living (and nonliving) things tick?. Homeostasis. Bread Mold Kills Bacteria. Glaciers With Chocolate. Rock Cycle. Homeostasis. Bread Mold Kills Bacteria. Glaciers With Chocolate. Rock Cycle.

Fractional reserve banking and the money supply. Overview of Fractional Reserve Banking. Weaknesses of Fractional Reserve Lending. Full Reserve Banking. Money Supply- M0 M1 and M2. Simple Fractional Reserve Accounting part 1. Simple Fractional Reserve Accounting (part 2). Interest as Rent for Money. Money Supply and Demand Impacting Interest Rates. Overview of Fractional Reserve Banking. Weaknesses of Fractional Reserve Lending. Full Reserve Banking. Money Supply- M0 M1 and M2. Simple Fractional Reserve Accounting part 1. Simple Fractional Reserve Accounting (part 2). Interest as Rent for Money. Money Supply and Demand Impacting Interest Rates.

Aggregate demand and aggregate supply. Keynesian thinking. Demand-pull and cost-push inflation. Fiscal and monetary policy. Aggregate Demand. Shifts in Aggregate Demand. Long-Run Aggregate Supply. Short Run Aggregate Supply. Demand-Pull Inflation under Johnson. Real GDP driving Price. Cost Push Inflation. The Business Cycle. Monetary and Fiscal Policy. Tax Lever of Fiscal Policy. Keynesian Economics. Risks of Keynesian Thinking. Aggregate Demand. Shifts in Aggregate Demand. Long-Run Aggregate Supply. Short Run Aggregate Supply. Demand-Pull Inflation under Johnson. Real GDP driving Price. Cost Push Inflation. The Business Cycle. Monetary and Fiscal Policy. Tax Lever of Fiscal Policy. Keynesian Economics. Risks of Keynesian Thinking.

What makes living things tick?. Homeostasis. A Voyage to Mars: Bone Loss in Space. Bread Mold Kills Bacteria.

Most people have had the flu virus at least once in their lives, and it

The core ideas in microeconomics. Supply, demand and equilibrium. Introduction to Economics. Law of Demand. Change in Expected Future Prices and Demand. Price of Related Products and Demand. Changes in Income, Population, or Preferences. Normal and Inferior Goods. Inferior Goods Clarification. Law of Supply. Factors Affecting Supply. Long Term Supply Curve. Market Equilibrium. Changes in Market Equilibrium. Breakdown of Gas Prices. Short-Run Oil Prices. Introduction to Economics. Law of Demand. Change in Expected Future Prices and Demand. Price of Related Products and Demand. Changes in Income, Population, or Preferences. Normal and Inferior Goods. Inferior Goods Clarification. Law of Supply. Factors Affecting Supply. Long Term Supply Curve. Market Equilibrium. Changes in Market Equilibrium. Breakdown of Gas Prices. Short-Run Oil Prices.

Watch fun, educational videos on all sorts of Physics questions. Thomas Young's Double Slit Experiment. Newton's Prism Experiment. Bridge Design and Destruction! (part 1). Bridge Design (and Destruction!) Part 2. Shifts in Equilibrium. The Marangoni Effect: How to make a soap propelled boat!. The Invention of the Battery. The Forces on an Airplane. Bouncing Droplets: Superhydrophobic and Superhydrophilic Surfaces. A Crash Course on Indoor Flying Robots. Heat Transfer. Thomas Young's Double Slit Experiment. Newton's Prism Experiment. Bridge Design and Destruction! (part 1). Bridge Design (and Destruction!) Part 2. Shifts in Equilibrium. The Marangoni Effect: How to make a soap propelled boat!. The Invention of the Battery. The Forces on an Airplane. Bouncing Droplets: Superhydrophobic and Superhydrophilic Surfaces. A Crash Course on Indoor Flying Robots. Heat Transfer.

Watch fun, educational videos on all sorts of Materials, how they're created and what they can do. Whats all the matter? Atoms and Molecules. What is Soap?. Flocculation: Making Clean Water. Manufacturing Processes: Hands On to Hands Off. Whats all the matter? Atoms and Molecules. What is Soap?. Flocculation: Making Clean Water. Manufacturing Processes: Hands On to Hands Off.

Ping pong ball launcher introduction. Build a ping pong ball launcher . Update and modify your ping pong ball launcher. Ping pong ball launcher introduction. Build a ping pong ball launcher . Update and modify your ping pong ball launcher.

Minima, maxima, and critical points. Rates of change. Optimization. Rates of change. L'Hopital's rule. Mean value theorem. Minima, maxima and critical points. Testing critical points for local extrema. Identifying minima and maxima for x^3 - 12x - 5. Concavity, concave upwards and concave downwards intervals. Recognizing concavity exercise. Recognizing concavity. Inflection points. Graphing using derivatives. Another example graphing with derivatives. Minimizing sum of squares. Optimizing box volume graphically. Optimizing box volume analytically. Optimizing profit at a shoe factory. Minimizing the cost of a storage container. Expression for combined area of triangle and square. Minimizing combined area. Rates of change between radius and area of circle. Rate of change of balloon height. Related rates of water pouring into cone. Falling ladder related rates. Rate of change of distance between approaching cars. Speed of shadow of diving bird. Mean Value Theorem. Introduction to L'H

How have humans protected their secret messages through history? What has changed today?. What is Cryptography?. Probability Space. The Caesar Cipher. Caesar Cipher Exploration. Frequency Fingerprint Exploration . Polyalphabetic Cipher. Polyalphabetic Exploration. The One-Time Pad. Perfect Secrecy Exploration. Frequency Stability. Coin flip sequences. Frequency Stability Exploration. The Enigma Encryption Machine (case study). Perfect Secrecy. Pseudorandom Number Generators. Random Walk Exploration. Ciphers vs. Codes. Shift Cipher. Caesar cipher encryption. Caesar Cipher Decryption. Caesar cipher frequency analysis. Vigenere cipher encryption. XOR Bitwise Operation. XOR & the One-Time Pad. XOR Exploration. Bitwise Operators. What's Next?. The Fundamental Theorem of Arithmetic. Public Key Cryptography: what is it?. The Discrete Logarithm Problem. Diffie-Hellman Key Exchange. RSA Encryption: step 1. RSA Encryption: step 2. RSA Encryption: step 3. Time Complexity (Exploration). Euler's Totient Function. Euler Totient Exploration. RSA Encryption: step 4. What should we learn next?. What is Modular Arithmetic?. Modulo Operator. Congruence Modulo. Congruence Relation. Equivalence Relations. The Quotient Remainder Theorem. Modular Addition & Subtraction. Modular Addition. Modular Multiplication. Modular Multiplication. Modular Exponentiation. Fast Modular Exponentiation. Fast Modular Exponentiation. Modular Inverses. Introduction. Primality Test Challenge. Trial Division. Level 1: Primality Test. Running Time. Level 2: measuring running time. Computer Memory (space). Binary Memory Exploration. Algorithmic Efficiency. Level 3: Challenge. Sieve of Eratosthenes. Level 4: Sieve of Eratosthenes. Primality Test with Sieve. Level 5: Trial division using sieve. The Prime Number Theorem. Prime density spiral. Prime Gaps. Time Space Tradeoff. Summary (what's next?). Randomized Algorithms (intro). Conditional Probability (Bayes Theorem) Visualized. Guess the coin. Random Primality Test (warm up). Level 9: Trial Divison vs Random Division. Fermat's Little Theorem. Fermat Primality Test. Level 10: Fermat Primality Test. What's Next?. What is Cryptography?. Probability Space. The Caesar Cipher. Caesar Cipher Exploration. Frequency Fingerprint Exploration . Polyalphabetic Cipher. Polyalphabetic Exploration. The One-Time Pad. Perfect Secrecy Exploration. Frequency Stability. Coin flip sequences. Frequency Stability Exploration. The Enigma Encryption Machine (case study). Perfect Secrecy. Pseudorandom Number Generators. Random Walk Exploration. Ciphers vs. Codes. Shift Cipher. Caesar cipher encryption. Caesar Cipher Decryption. Caesar cipher frequency analysis. Vigenere cipher encryption. XOR Bitwise Operation. XOR & the One-Time Pad. XOR Exploration. Bitwise Operators. What's Next?. The Fundamental Theorem of Arithmetic. Public Key Cryptography: what is it?. The Discrete Logarithm Problem. Diffie-Hellman Key Exchange. RSA Encryption: step 1. RSA Encryption: step 2. RSA Encryption: step 3. Time Complexity (Exploration). Euler's Totient Function. Euler Totient Exploration. RSA Encryption: step 4. What should we learn next?. What is Modular Arithmetic?. Modulo Operator. Congruence Modulo. Congruence Relation. Equivalence Relations. The Quotient Remainder Theorem. Modular Addition & Subtraction. Modular Addition. Modular Multiplication. Modular Multiplication. Modular Exponentiation. Fast Modular Exponentiation. Fast Modular Exponentiation. Modular Inverses. Introduction. Primality Test Challenge. Trial Division. Level 1: Primality Test. Running Time. Level 2: measuring running time. Computer Memory (space). Binary Memory Exploration. Algorithmic Efficiency. Level 3: Challenge. Sieve of Eratosthenes. Level 4: Sieve of Eratosthenes. Primality Test with Sieve. Level 5: Trial division using sieve. The Prime Number Theorem. Prime density spiral. Prime Gaps. Time Space Tradeoff. Summary (what's next?). Randomized Algorithms (intro). Conditional Probability (Bayes Theorem) Visualized. Guess the coin. Random Primality Test (warm up). Level 9: Trial Divison vs Random Division. Fermat's Little Theorem. Fermat Primality Test. Level 10: Fermat Primality Test. What's Next?.

Everything in the universe can be measured. Under Pressure. Earth's Tilt 1: The Reason for the Seasons. Earth's Tilt 2: Land of the Midnight Sun. 2D Equilibrium -- Balancing Games. Under Pressure. Earth's Tilt 1: The Reason for the Seasons. Earth's Tilt 2: Land of the Midnight Sun. 2D Equilibrium -- Balancing Games.

Start your own robotics project with Spout, Spider, and Bit-zee!. 3rd graders build robots at Santa Rita Elementary School. See inside Spout's motors and switches. Spout 1. Spout 2. Spout 3. Spout 4. Spout 5. Spout 6. Spout 7. Spout 8. Spout 9. Spout 10. Spout 11. 6th graders learn to build a Spider robot. Parts list for Spider. 1 Spider parts and tools. 2 Hacking Spider's click n' stick. 3 Creating the battery and motor mounts for Spider. 4 Attach Spider's click n' stick base to the batteries and thread his wires. 5 Attach Spider's motor controller and wire his motors. 6 Connect Spider's power switch and run the power wires to the motor controller. 7 Attach and adjust the Spider's bezel. 8 Attach Spider's wheels. 9 Make the connnectors for Spider's Arduino Nano. 10 Spider Connect the power and signal wires from the motor controller to the Arduino. 11 Attach Spider's LED eyes. 12 Connect Spider's stablizer bar. 13 Spider's Romance. 14 Teaching Spider to dance. 15 Ben Eater's Spider Bot. 1. Bit-zee. 2. Bit-zee (long version). 3. Bit-zee Bot Introduction. 4. Bit-zee planning and propulsion. 5. Bit-zee's bits. 6. Bit-zee's chassis/frame. 7. Bit-zee's wheel mounts and fenders. 8. Bit-zee's component mounting holes. 9. Bit-zee's batteries. 10. Improving the battery wires. 11. Connecting Bit-zee's power wires and on-off switch. 12. Bit-zee's motors. 13. Why does Bit-zee need a motor controller?. 14. Bit-zee's motor controller. 15. Attaching and wiring Bit-zee's motor controller. 16. Attaching Bit-zee's Arduino. 17. How to hotwire a digital camera. 18. Attaching Bit-zee's digital camera. 19. Bit zee's 5 Volt power distribution board. 20. Hacking and attaching a digital recorder/player to Bit-zee. 21. Making a power connector for the Arduino. 22. Attaching Bit-zee's prototype board. 23. Connecting the motor controller to the Arduino. 24. Connecting Bit-zee's camera to the Arduino. 25. Bit-zee's bumper switches. 26. Bit-zee's eyes. 27. Bit-zee's IR sensor. 28. Bit-zee's shell. 29. Camera wiring update. 30. Load the Code for It-zee and Bit-zee. 1 Spout Introduction. 2 Attach Spout's lever switches and motors. 3 Attach Spout's wires and connectors. 4 Attach Spout's sliding switches and resistors. 5 Connect Spout's antenna. 6 Attach Spout's LED eyes. See inside Spout's motors and switches. 3rd graders build robots at Santa Rita Elementary School. See inside Spout's motors and switches. Spout 1. Spout 2. Spout 3. Spout 4. Spout 5. Spout 6. Spout 7. Spout 8. Spout 9. Spout 10. Spout 11. 6th graders learn to build a Spider robot. Parts list for Spider. 1 Spider parts and tools. 2 Hacking Spider's click n' stick. 3 Creating the battery and motor mounts for Spider. 4 Attach Spider's click n' stick base to the batteries and thread his wires. 5 Attach Spider's motor controller and wire his motors. 6 Connect Spider's power switch and run the power wires to the motor controller. 7 Attach and adjust the Spider's bezel. 8 Attach Spider's wheels. 9 Make the connnectors for Spider's Arduino Nano. 10 Spider Connect the power and signal wires from the motor controller to the Arduino. 11 Attach Spider's LED eyes. 12 Connect Spider's stablizer bar. 13 Spider's Romance. 14 Teaching Spider to dance. 15 Ben Eater's Spider Bot. 1. Bit-zee. 2. Bit-zee (long version). 3. Bit-zee Bot Introduction. 4. Bit-zee planning and propulsion. 5. Bit-zee's bits. 6. Bit-zee's chassis/frame. 7. Bit-zee's wheel mounts and fenders. 8. Bit-zee's component mounting holes. 9. Bit-zee's batteries. 10. Improving the battery wires. 11. Connecting Bit-zee's power wires and on-off switch. 12. Bit-zee's motors. 13. Why does Bit-zee need a motor controller?. 14. Bit-zee's motor controller. 15. Attaching and wiring Bit-zee's motor controller. 16. Attaching Bit-zee's Arduino. 17. How to hotwire a digital camera. 18. Attaching Bit-zee's digital camera. 19. Bit zee's 5 Volt power distribution board. 20. Hacking and attaching a digital recorder/player to Bit-zee. 21. Making a power connector for the Arduino. 22. Attaching Bit-zee's prototype board. 23. Connecting the motor controller to the Arduino. 24. Connecting Bit-zee's camera to the Arduino. 25. Bit-zee's bumper switches. 26. Bit-zee's eyes. 27. Bit-zee's IR sensor. 28. Bit-zee's shell. 29. Camera wiring update. 30. Load the Code for It-zee and Bit-zee. 1 Spout Introduction. 2 Attach Spout's lever switches and motors. 3 Attach Spout's wires and connectors. 4 Attach Spout's sliding switches and resistors. 5 Connect Spout's antenna. 6 Attach Spout's LED eyes. See inside Spout's motors and switches.

18. Attaching Bit-zee's digital camera.

Khan Academy Vision and Social Return. Videocast with Sal Khan: Effectively Using Khan Academy. KA on John Stossel Documentary. Khan Academy on Perry's Principles (6/2/2011). ED SESSION III with Sal Khan - Reactions in Idaho. Salman Khan on CNN. Salman Khan at TiEcon 2011. PBS NewsHour on the Khan Academy. Salman Khan Speaks at GEL (Good Experience Live) Conference. Salman Khan Talk at the MIT Club of Northern California. Salman Khan talk at Castilleja School on January 5th, 2010. Sal Khan Interview with IT Conversations - January 31,2010. Salman Khan interview with NPR's All Things Considered on 12/28/2009. Salman Khan Interview with Mixergy.com. Brian Lehrer Interview with Salman Khan. TEDxSanJoseCA - Salman Khan - (Sequel to talk at TED). Bay Area CBS Station with Salman Khan. Fareed Zakaria talks about Khan Academy on CNN GPS. Sal on Dylan Ratigan show. Khan Academy on the Gates Notes. LinkedIn Speaker Series Salman Khan. Forbes Names You Need To Know: Khan Academy. Salman Khan on Big Think. Khan Academy on 20/20 (Sep 2011). Salman Khan on Marketplace (NPR) on 5-24-2011. May 29th, 2011 CNN Piece. Sal during Education Week (Sep 2011) 1. Khan Academy on California Report (June 2011). Ideal Math and Science Class Time. Salman Khan on KQED MindShift. NPR Story on KA Los Altos Pilots (June 2011). Salman Khan interviewed on NPR's On Point. 21st Century Challenges (Royal Geographic Society). Answers to Questions from the Independent. Answers for Malibu Magazine. NCSU Answers. Questions from Superinteressante (8-22-2011). Brainwave Sep 2011. Center for Future of Museums. School Leadership Briefing Questions (Sep 12 2011) 2. School Leadership Briefing (Sep 12 2011). Tom Brokaw interviews Sal at Education Nation 2011. Financial Times October 2011. Verbal Answers to "Ask Me Anything" on Reddit. Khan Academy in Idaho. The Language Advocates. Jessica Yuen. Marcos Ojeda. Elizabeth Slavitt. Minli Virdone. Ideal Math and Science Class Time. Salman Khan on Charlie Rose. Nightline: Learn Everything, Online. Khan Academy on PBS NewsHour (Edited). Khan Academy on Nightly News. Early Show. Sal on ABC News. CNN: Google award to Khan Academy. Videocast with Sal Khan: Effectively Using Khan Academy. Overview of KhanAcademy.org. Khan Academy Vision and Social Return. Videocast with Sal Khan: Effectively Using Khan Academy. KA on John Stossel Documentary. Khan Academy on Perry's Principles (6/2/2011). ED SESSION III with Sal Khan - Reactions in Idaho. Salman Khan on CNN. Salman Khan at TiEcon 2011. PBS NewsHour on the Khan Academy. Salman Khan Speaks at GEL (Good Experience Live) Conference. Salman Khan Talk at the MIT Club of Northern California. Salman Khan talk at Castilleja School on January 5th, 2010. Sal Khan Interview with IT Conversations - January 31,2010. Salman Khan interview with NPR's All Things Considered on 12/28/2009. Salman Khan Interview with Mixergy.com. Brian Lehrer Interview with Salman Khan. TEDxSanJoseCA - Salman Khan - (Sequel to talk at TED). Bay Area CBS Station with Salman Khan. Fareed Zakaria talks about Khan Academy on CNN GPS. Sal on Dylan Ratigan show. Khan Academy on the Gates Notes. LinkedIn Speaker Series Salman Khan. Forbes Names You Need To Know: Khan Academy. Salman Khan on Big Think. Khan Academy on 20/20 (Sep 2011). Salman Khan on Marketplace (NPR) on 5-24-2011. May 29th, 2011 CNN Piece. Sal during Education Week (Sep 2011) 1. Khan Academy on California Report (June 2011). Ideal Math and Science Class Time. Salman Khan on KQED MindShift. NPR Story on KA Los Altos Pilots (June 2011). Salman Khan interviewed on NPR's On Point. 21st Century Challenges (Royal Geographic Society). Answers to Questions from the Independent. Answers for Malibu Magazine. NCSU Answers. Questions from Superinteressante (8-22-2011). Brainwave Sep 2011. Center for Future of Museums. School Leadership Briefing Questions (Sep 12 2011) 2. School Leadership Briefing (Sep 12 2011). Tom Brokaw interviews Sal at Education Nation 2011. Financial Times October 2011. Verbal Answers to "Ask Me Anything" on Reddit. Khan Academy in Idaho. The Language Advocates. Jessica Yuen. Marcos Ojeda. Elizabeth Slavitt. Minli Virdone. Ideal Math and Science Class Time. Salman Khan on Charlie Rose. Nightline: Learn Everything, Online. Khan Academy on PBS NewsHour (Edited). Khan Academy on Nightly News. Early Show. Sal on ABC News. CNN: Google award to Khan Academy. Videocast with Sal Khan: Effectively Using Khan Academy. Overview of KhanAcademy.org.

Reenact the discovery of electromagnetism. The Magic of Discovery. Discovery of Magnetism. Discovery of Magnetic Fields. Electromagnet.