Brit explains the Caesar cipher, the first popular substitution cipher, and shows how it was broken with "frequency analysis". Created by Brit Cruise.

Café Denj is 14 episodes of short stories made for Advanced Persian Language Learners. The purpose of producing this series of videos that are all linked together was to help those who are learning modern Persian as well as offering a better understanding of the Persian culture as it is in Iran today.

Gustave Caillebotte, Man at his Bath, 1884, oil on canvas, 57 x 45 in. (144.8 x 114.3 cm), (Private Collection, on loan to the National Gallery, London) Speakers: Dr. Parme Giuntini, Director of Art History, Otis College of Art and Design Dr. Robert Summers, Lecturer, Otis College of Art and Design. Created by Beth Harris and Steven Zucker.

Gustave Caillebotte, The Floor Scrapers (Les raboteurs de parquet), 1875, oil on canvas, 102 x 146.5 cm (Musée d'Orsay, Paris). Speakers: Dr. Parme Giuntini, Director of Art History, Otis College of Art and Design and Dr. Robert Summers, lecturer, Otis College of Art and Design. Created by Beth Harris and Steven Zucker.

In this lesson, students complete real-world calculations related to residential solar energy use, including the number of solar panels needed to power the average house and how many solar panels could fit on their own home or a local building.

Step 1 - Inquire: Students complete calculations to determine if the average American home could be powered using solar panels.

Step 2 - Investigate: Students explore the Google Project Sunroof site and use data on their home address to solve problems.

Step 3 - Inspire: Students discuss the benefits and drawbacks to using solar energy and explore equity issues related to the affordability of solar panels.

Recall that the tax multiplier and expenditure multiplier magnify the effect of any change in spending or taxes. In this video, we use that fact to calculate the amount of spending or tax change necessary to close output gaps.

This is a brief conditional probability examplediscussing probabilities like P(A | B) using breakfast and lunch as examples.

Calculating the dot and cross products when vectors are presented in their x, y, and z (or i, j, and k) components. Created by Sal Khan.

In this video we take a slightly different approach to understanding the difference between real and nominal values: find the value of an asset in a previous year's dollars. Created by Sal Khan.

This is a lesson on finding the difference between an implicit and explicit function and finding the derivative of functions implicitly. It also covers finding the equation of a tangent line from a function in implicit form . There are self check throughout the lesson. The text that I use in my calculus class is Larson Calculus 11th edition. This corresponds to chapter 2 section 5 in that text but Implicit Differentiation is a common topic in any Calculus I or AP Calculus course.

Met curator Marla Prather on motion in Alexander Calder’s Mobile, 1941. Alexander Calder was born to a family of sculptors. His grandfather, Alexander Milne Calder (1846-1923), studied with Thomas Eakins and is famous for the elaborate sculptural decorations of Philadelphia's City Hall. Calder himself had studied to be an engineer at the Stevens Institute of Technology before attending the Art Students League in New York. Like many aspiring artists of his generation, Calder then spent time in Paris where he was inspired by Joan Miró's work and absorbed the playfulness of Dada. Indeed, it was the French artist Marcel Duchamp who christened Calder's hanging sculptures "mobiles." For works such as this one, Calder cut sheet metal into various shapes and assembled these elements in a chain-linked system so that the flat metal pieces move in response to currents of air. This particular mobile was included in the 1942 exhibition "Artists for Victory" at the Metropolitan where the sculpture committee awarded it a prize and recommended it be added to the collection. Created by The Metropolitan Museum of Art.

An option, like a call option, can provide leverage because it allows a bet on a stock to be multiplied many times. Learn how call options provide leverage in this video. Created by Sal Khan.

A call payoff diagram is a way of visualizing the value of a call option at expiration based on the value of the underlying stock. Learn how to create and interpret call payoff diagrams in this video. Created by Sal Khan.

Do you know how many calories are in a macadamia nut? This video segment highlighting a Calorimetry experiment will give you the answer.

Camel, first half of the 12th century, fresco transferred to canvas, from San Baudelio de Berlanga, Spain (Met Cloisters, New York) speakers: Dr. Lauren Kilroy-Ewbank and Dr. Steven Zucker. Created by Smarthistory.

In this video we wire Bit-zee's camera's shutter and power functions to some transistors on the bread board and then we connect the transistors to the Arduino. Created by Karl Wendt.

Now we'll add a lens to our camera and explore the idea of an f-stop.