Is it possible to take an equilateral triangle and cut it in half to make a 30-60-90 special triangle to make it easier to solve a problem? Why yes, of course! It's even possible to find the missing length without using the Pythagorean...

The video quickly reviews the definition of scientific notation, and then demonstrates how to multiply two numbers in scientific notation together and how to rewrite the final answer if necessary. It does not show an example...

Introduce learners to the discriminant. The discriminant, used to find the number of real solutions to a quadratic equation, is part of the quadratic formula. The video shows where in the formula you can find it, and provides an example...

Help your class take on the least common denominator by providing them with this informational video. The video gives a definition of the least common denominator and includes an example using 2 algebraic fractions. This is definitely a...

Since the focus of this video is on explaining the solution to a system of equations, the lecturer does not work through the problem. Instead, she points out that the solution should be an ordered pair that makes each equation a true...

A quick definition of the subtraction property of equality, this video could be used to introduce your class to the concept. Complement your lesson, or send learners home with the link to the video for further study.

What does a dad do? Listen to this song to find out. In this song, dad plants veggies, plays basketball, reads books, and teaches his children to ride bikes. Ask your preschoolers what types of things their dads do.

Listen to one of Billy Sunday's sermons denouncing liquor and the government's taxing of it. [12:19 min.]

Listen to a speech by Aimee Semple McPherson, well-known evangelical preacher in the 1920s, where she talks about Prohibition. [12:19 min.]

Listen to this interesting interview historian Herbert T. Hoover had with Sioux tribal chief, Amos Owen. Owen discusses the pros and cons of the Indian Reorganization Act of 1934. [12:19]

Listen to an interview [12:19] with a Sioux tribal leader who discussed the positive changes brought by the Indian Reorganization Act of 1934. It dramatically changed the federal government's policies toward Native Americans.

A show that uses forensic science to revisit some of history's unsolved dramatic murders. Website includes a collection of past episodes. See how fingerprints, DNA, and bones are new forms of evidence solving these crimes.