These are two simple missing shape optical illusions shown in black and white. The existence of a white triangle can easily be imagined in the top image while your brain can also easily create the existence of a white sphere in the lower...

This excellent optical illusion is confusing because when you look at it, it appears that the nine wheels are moving, when in fact they are not.

This optical illusion, known as the Orbison illusion, gives the effect that the rectangle and inner square are distorted. This effect is caused by the horizontal V shaped lines.

This famous optical illusion makes the parallel horizontal lines appear to be bent when in fact they are straight. It was originally noticed amongst the tiles of a cafe wall and can now be seen in architecture such as on a large building...

Does this optical illusion show a man playing a saxophone or a woman's face? You be the judge.

This is a vertical and horizontal line length optical illusion. The vertical line that is part of the image on the left looks longer than the horizontal line but when it is checked with a ruler on the right image it is proved that they...

A sound biography, focusing mainly on Bragg's science, what he discovered and what it's significance was. Lists many of his honors.

A short biographical sketch on the life and work of Augustin Fresnel (1788-1827). Comments on a few of his scientific accomplishments.

This life of Isaac Newton' traces his life from birth through childhood to his rise as a renown scientist and mathematician.

This article from Khan Academy provides information about refraction and light bending. This information is intended for the Class 12 Physics Course (India).

Test your knowledge of the human eye with this interactive labeling exercise.

Learn what black holes are and the myths that surround them.

This Nobel website on the life and scientific work of Robert A. Millikan includes a biography, images, and internet resources for further reading and research. Also included are the 1923 "Presentation Speech" which praised Millikan's...

Students learn to understand color from a variety of perspectives: physiology, psychology, philosophy, and art.

This site from Hanover College gives a tutorial on issues of visual representation, such as depth, perspective, texture, shadow, illusion. Begins at an introductory level. Numerous pictures.

Brief biography of Mohammad ibn Zakariya al-Razi, famous for his contributions to the fields and studies of medicine, astronomy, philosophy, and physics.

This webpage is a great resource for elementary teachers who are looking for activities, lessons, facts, and experiments pertaining to the eye.

Source of information on the subject of weather photography. There are great links, images and tips on equipment to use. For the intermediate to advanced photographer.

A very brief biography that lists his major accomplishments including the invention of the kaleidoscope.

Hunkin's Experiments is a group of simple cartoon illustrations of scientific principles. Some would work well in the classroom, but others have little value beyond entertaining students. All of the projects are easy to do and use...

This article from Khan Academy provides information about mirrors. This information is intended for the Class 12 Physics Course (India).

Have you ever wondered why some people need glasses and others don't? It's because of the way light is focused by the lens in your eye. This lens, like magnifying glasses, eyeglasses, and contact lenses, is considered a thin lens.

Under the title, "Thin Lens and The Thin-Lens Equation," this site provides an animation of an object responding to the changes of its distance to the lens.

Illustration of a magnifying glass.