Looks at how to use multiplication to calculate the overall probability of two independent events happening. Uses the example of two tosses of a coin. [6:00]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Notes defining dependent and independent clauses, followed by an eleven-slide PowerPoint presentation defining and giving examples of simple, compound, and complex sentences. More notes explain subordinating conjunctions, conjunctive adverbs, coordinating conjunctions, and how to use them to combine clauses. An animated video is also provided to demonstrate how to combine clauses to create compound sentences. [0:52]

Students gain a better understanding of the different types of materials as pure substances and mixtures and learn to distinguish between homogeneous and heterogeneous mixtures by discussing an assortment of example materials they use and encounter in their daily lives.

Students learn about the periodic table and how pervasive the elements are in our daily lives. After reviewing the table organization and facts about the first 20 elements, they play an element identification game. They also learn that engineers incorporate these elements into the design of new products and processes. Acting as computer and animation engineers, students creatively express their new knowledge by creating a superhero character based on of the elements they now know so well. They will then pair with another superhero and create a dynamic duo out of the two elements, which will represent a molecule.

This site provides multiple resources on the different types of sentences. Students can observe a presentation on simple, compound, and complex sentences, watch a video [4:19] about simple sentences, and link to a video about compound and complex sentences. A music video on compound and complex sentences [5:16], along with a presentation and additional video [0:46] that distinguishes active and passive voice.

This tutorial-quiz for pronoun usage features many examples of where pronouns fit in a sentence to achieve proper antecedent agreement.

This site shows how to repair run-on sentences. Students and teachers will find this interactive resource helpful.

Examples of simple and compound meters, as well as explanations of the terms duple, triple, and quadruple. Plenty of illustrations accompany this terrific resource. (Macromedia Flash is necessary to view this site) By MusicTheory.net.

Students apply the mechanical advantages and problem-solving capabilities of six types of simple machines (wedge, wheel and axle, lever, inclined plane, screw, pulley) as they discuss modern structures in the spirit of the engineers and builders of the great pyramids. While learning the steps of the engineering design process, students practice teamwork, creativity and problem solving.

Dr. Chris Muhlstein explains the challenge of studying materials that are too small to see with the naked eye. The technique some scientists use to observe individual atoms is similar to the technique of using touch to find out the size, shape, and location of objects in a small room. [1:05]

Emma Bryce explains how one-word sentences illustrate some lexical ambiguities that can turn ordinary words and sentences into mazes that mess with our minds. [3:28]

This video/animation shows that a molecule of water is made up of oxygen and hydrogen atoms. When oxygen and hydrogen atoms exist alone, their properties are different from the properties they have when they are chemically combined to form a water molecule.