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  1. Addition and subtraction with fractions | Khan Academy

    Practice Interpret dot plots with fraction operations Get 3 of 4 questions to level up!

  2. Mechanics (kinematics of motion in a straight line) | Khan Academy

    Learn Introduction to one-dimensional motion with calculus Interpreting direction of motion from position-time graph Interpreting direction of motion from velocity-time graph Interpreting change in speed from …

  3. Mode of DNA replication: Meselson-Stahl experiment

    In this model, DNA replication results in one molecule that consists of both original DNA strands (identical to the original DNA molecule) and another molecule that consists of two new strands (with …

  4. Interpreting statements about vectors (video) | Khan Academy

    Vector quantities have both a magnitude and a direction. In this example, we interpret a mathematical statement about two vector quantities in terms of the real-world quantities they represent.

  5. Cross product 2 (video) | Vectors in space | Khan Academy

    Let me cordon it off so you don't get confused. So that was me using the right hand rule when I tried to do a cross b, and then we saw that the magnitude of this was 25, and n, the direction, pointed …

  6. Trigonometric functions | Khan Academy

    Practice Interpret trigonometric graphs in context Get 3 of 4 questions to level up!

  7. Introduction to projections (video) | Khan Academy

    Let me define my line l to be the set of all scalar multiples of the vector-- I don't know, let's say the vector 2, 1, such that c is any real number. Let me draw my axes here.

  8. Face rev (its me!) - Khan Academy

    TREND SO DONT FLAME ME IM SLOW AND BAD AT GRAPHICS I AM NOT A FOLLOWER I AM A LEADER I AM THE LEADER I AM SPIDERMAN //ok so how i did it i picked a picture of me and fed it …

  9. Phylogenetic trees | Evolutionary tree (article) | Khan Academy

    Learn about phylogenetic trees and how to interpret them to determine which species are most related.

  10. Gel electrophoresis (article) | Khan Academy

    Using electrophoresis, we can see how many different DNA fragments are present in a sample and how large they are relative to one another. We can also determine the absolute size of a piece of DNA by …