Finance and capital markets on Khan Academy: Options allow investors and speculators to hedge downside (or upside). It allows them to trade on a belief that prices will change a lot–just not clear about direction. It allows them to benefit in any market (with leverage) if they speculate correctly. This tutorial walks through option basics and even goes into some fairly sophisticated option mechanics.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We’ve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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Legendary MIT physics professor Walter Lewin describes some of the science that will be in action during the Winter Olympics in Sochi. In less than 100 seconds, he explains how ice skaters use their arms to moderate their moment of inertia, which in turn affects the speed of their spins. Visit physicsworld.com for more videos,…

Learn how to determine whether two triangles are similar given the coordinate points of the vertices of the triangle. Two triangles are said to be equal when the corresponding angles of the triangles are congruent (equal) or when the corresponding side lengths are proportional. When given the cordinate points of the vertices of a triangle,…

This physics video tutorial provides a basic introduction into how to solve simple harmonic motion problems in physics. It explains how to calculate the frequency, period, spring constant and the angular frequency of a mass-spring system. It also explains how to find the amplitude and frequency from a displacement cosine equation. New Physics Video Playlist:…

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