The plane crash that killed Poland's President Lech Kaczynski, his wife, and many government and military officials.

View video footage from the scene of the plane accident that claimed the life of Polish President Lech Kaczynski, the first lady and key figures in the Polish Government. Was it pilot error, or that the Soviet-designed plane was more...

An interactive Java applet from the University of Utah that allows users to investigate the effect of the coefficient of friction on the motion of a block sliding down an incline. Initial height of the block and the friction coefficient...

An explanation of the events which occurred and attitudes which prevailed during the Cuban Missile Crisis of October, 1962.

A contour map of the boundaries of the Great Plains and Lewis front ranges of western Montana, showing the abrupt change in the topography. The heavy black line indicates the outcrop of the Lewis thrust plane.

A picture of Picasso's Man with Hat and a Violin. This is an example of Synthetic Cubism, a style characterized by large superimposed planes and clear geometric structure.

View video footage from the scene of the plane accident that claimed the life of Polish President Lech Kaczynski, the first lady and key figures in the Polish Government. Was it pilot error, or that the Soviet-designed plane was more...

This site describes lines and angles "as found in various plane (flat) geometric figures.".

This site describes lines and angles "as found in various plane (flat) geometric figures.".

This site describes lines and angles "as found in various plane (flat) geometric figures.".

Polish President Lech Kaczynski who was killed in a plane crash in April of 2010.

Listen to interviews with World War I veterans who fought in the air in World War I.

Contains a lesson and practice exercises about complex numbers in a complex plane.

A full and complete discussion of the simple machine called the screw, a modified inclined plane. Many examples and drawings and applications.

This site contains a vast amount of information relating to the hyperbola, including the definition of a hyperbola, equations in various systems, including polar, and many important characteristics of hyperbolas. Site also provides many...

This University of St. Andrews site gives the parametric and cartesian equation for a hyperbola along with an example graph. The site offers links to related curves.

Shows the graph and the parametric cartesian equation. The site also includes links to graphs of related curves and definitions of the associated curves.

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...

An excellent resource for learning about the U-2 spy plane flown by Francis Gary Powers that was shot down over Russia in 1960. Contains a very detailed examination of the origins of spy plane missions plus fabulous details that bring...