The Learning Edge

## Mitochondria | Structure of a cell | Biology | Khan Academy

The structure and role of mitochondria (plural for mitochondrion). Discusses the outer membrane, inner membrane, cristae, porins, etc. Watch the next lesson: https://www.khanacademy.org/science/biology/structure-of-a-cell/tour-of-organelles/v/cytoskeletons?utm_source=YT&utm_medium=Desc&utm_campaign=biology Missed the previous lesson? https://www.khanacademy.org/science/biology/structure-of-a-cell/tour-of-organelles/v/endomembrane-system?utm_source=YT&utm_medium=Desc&utm_campaign=biology Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and […]

## Filling rectangles with squares | Geometry | Early Math | Khan Academy

Learn how to fill rectangles with squares. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-fractions-of-shapes/e/filling-rectangles-with-same-sized-squares?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-fractions-of-shapes/v/equal-parts-of-circles-and-rectangles?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-fractions-of-shapes/v/halves-and-fourths?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. […]

## IIT JEE trigonometry problem 1 | Trig identities and examples | Trigonometry | Khan Academy

2010 IIT JEE Paper I #29 Trigonometry problem Watch the next lesson: https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/more-trig-examples/v/iit-jee-trigonometric-maximum?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry Missed the previous lesson? https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/more-trig-examples/v/2003-aime-ii-problem-14?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry Trigonometry on Khan Academy: Big, fancy word, right? Don’t be fooled. Looking at the prefix, tri-, you could probably assume that trigonometry (“trig” as it’s sometimes called) has something to do with triangles. You would be right! […]

## Cell theory | Structure of a cell | Biology | Khan Academy

Introduction to cell theory–the idea that 1) all living things are made of one or more cells, 2) cells are the basic unit of life and 3) all cells come from other cells. Explore the roles that Hooke, Leeuwenhoek and others played in developing cell theory. Watch the next lesson: https://www.khanacademy.org/science/biology/structure-of-a-cell/prokaryotic-and-eukaryotic-cells/v/cell-size?utm_source=YT&utm_medium=Desc&utm_campaign=biology Missed the previous lesson? […]

## Counting dollars | Measurement and data | Early Math | Khan Academy

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-money/v/counting-dollars?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-money/v/counting-american-coins?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-time/v/telling-time-exercise-example-2?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, […]

## Measuring a golden statue | Measurement and data | Early Math | Khan Academy

Measure an object with same-size length units that span it with no gaps or overlaps. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-picture-graphs/e/solving-problems-with-picture-graphs-1?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-picture-graphs/v/picture-graphs?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-length-word-problems/v/length-word-problems?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and […]

## Telling time exercise example 2 | Measurement and data | Early Math | Khan Academy

Tell time on unlabeled analog clocks. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-time/e/telling_time?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-money/v/counting-dollars?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-measure-data-topic/cc-early-math-time/v/telling-time-exercise-example-1?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once […]

## Counting whales, sheep, and flowers | Counting | Early Math | Khan Academy

Learn how to count animals. Animals in these pictures are organized neatly. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-count-object-topic/e/how-many-objects-1?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-count-object-topic/v/counting-objects-2?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-counting-topic/cc-early-math-count-object-topic/v/counting-in-scenes?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation […]

## Adding by getting to group of 10 first | Early Math | Khan Academy

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-making-groups-of-ten/e/making-100?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-sub-ones-tens/v/understanding-place-value-while-subtracting-ones?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-making-groups-of-ten/v/addition-using-groups-of-10-intro?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, […]

## Representing structures of organic molecules | Biology | Khan Academy

Representing Structures of Organic Molecules Watch the next lesson: https://www.khanacademy.org/science/biology/properties-of-carbon/hydrocarbon-structures-and-functional-groups/v/hydrocarbon-overview?utm_source=YT&utm_medium=Desc&utm_campaign=biology Missed the previous lesson? https://www.khanacademy.org/science/biology/properties-of-carbon/carbon/v/silicon-based-life?utm_source=YT&utm_medium=Desc&utm_campaign=biology Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the […]

## Exercising gorillas | Addition and subtraction within 20 | Early Math | Khan Academy

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-word-problems-within-20/e/addition-and-subtraction-word-problems-within-20–level-2?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-word-problems-more-fewer-20/v/comparison-word-problems?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-20/cc-early-math-word-problems-within-20/v/sea-monsters-and-superheroes?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, […]

## Statistics: Sample variance | Descriptive statistics | Probability and Statistics | Khan Academy

Using the variance of a sample to estimate the variance of a population Watch the next lesson: https://www.khanacademy.org/math/probability/random-variables-topic/random_variables_prob_dist/v/random-variables?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Missed the previous lesson? https://www.khanacademy.org/math/probability/descriptive-statistics/old-stats-videos/v/statistics-variance-of-a-population?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? Busted! Did you decide […]

## Halves and fourths | Geometry | Early Math | Khan Academy

Learn how to divide shapes into two or four equal sections. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-fractions-of-shapes/e/halves-and-fourths?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Watch the next lesson: https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-fractions-of-shapes/v/filling-rectangles-with-squares?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Missed the previous lesson? https://www.khanacademy.org/math/early-math/cc-early-math-geometry-topic/cc-early-math-composing-shapes/v/compose-shapes?utm_source=YT&utm_medium=Desc&utm_campaign=EarlyMath Early Math on Khan Academy: Math begins with counting. It’s the most important skill we learn in our early years and becomes the foundation for […]

## Standard error of the mean | Inferential statistics | Probability and Statistics | Khan Academy

Standard Error of the Mean (a.k.a. the standard deviation of the sampling distribution of the sample mean!) Watch the next lesson: https://www.khanacademy.org/math/probability/statistics-inferential/sampling_distribution/v/sampling-distribution-example-problem?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Missed the previous lesson? https://www.khanacademy.org/math/probability/statistics-inferential/sampling_distribution/v/sampling-distribution-of-the-sample-mean-2?utm_source=YT&utm_medium=Desc&utm_campaign=ProbabilityandStatistics Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? […]