The Vitruvian Man

Leonardo’s famous sketch was made as a study of the male human proportions. It was based on text written by the ancient Roman architect Vitruvius.
The multiple viewpoints seen in the drawing serve to illustrate that there are no universal set of proportions for the human body.
Vitruvius states that the centre of the body is the navel, but Leonardo’s sketch shows that this depends on the position of the arms and legs, and when the figure is in the standing position, the centre of gravity is actually lower than the navel.

Solar Eclipse

Total solar eclipses occur when the Moon comes between the Sun and the Earth and casts the darkest part of its shadow (the umbra) on Earth. The darkest point of the eclipse is almost as dark as night.

Telescope

A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the Netherlands at the beginning of the 1600s, by using glass lenses. They found use in both terrestrial applications and astronomy.

Dad and three sons on a clear night looking thru a telescope Check out this light box with other Astronaut/Space Images by Nashville Photographer, Dieter Spears, Owner of Inhaus Creative. [url=http://www.istockphoto.com/search/lightbox/2459726#898cb29][img]http://dieterspears.com/istock/links/button_space.jpg[/img][/url]

History of radiation therapy

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the medical application of caustic substances doctors began using radiation to treat growths and lesions produced by diseases such as lupus, rodent ulcer, and epithelioma. Radiation was generally believed to have bactericidal properties, so when radium was discovered, in addition to treatments similar to those used with x-rays, it was also used as an additive to medical treatments for diseases such as tuberculosis where there were resistant bacilli.

Gravity

Gravity is a force pulling together all matter (which is anything you can physically touch). The more matter, the more gravity, so things that have a lot of matter such as planets and moons and stars pull more strongly.

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