As part of the original design, the names of 72 French scientists and other famous people is imprinted on the sides of the Eiffel tower

On the Eiffel Tower, seventy-two names of French scientists, engineers, and mathematicians are engraved in recognition of their contributions. Eiffel chose this “invocation of science” because of his concern over the protests against the tower. The engravings are found on the sides of the tower under the first balcony. The engraving was painted over at the beginning of the twentieth century and restored in 1986–1987 by Société Nouvelle d’exploitation de la Tour Eiffel, a company contracted to operate business related to the Tower. The Tower is owned by the city of Paris. The letters were originally painted in gold and are about 60 cm high. The repainting of 2010/2011 restored the letters to their original gold colour.

The list is split in four parts (for each side of the tower). The sides have been named after the parts of Paris that each side faces.

Research on pigs led to the development of CAT scans.

In the early 1900s, the Italian radiologist Alessandro Vallebona proposed a method to represent a single slice of the body on the radiographic film. This method was known as tomography. The idea is based on simple principles of projective geometry: moving synchronously and in opposite directions the X-ray tube and the film, which are connected together by a rod whose pivot point is the focus; the image created by the points on thefocal plane appears sharper, while the images of the other points annihilate as noise. This is only marginally effective, as blurring occurs in only the “x” plane. There are also more complex devices that can move in more than one plane and perform more effective blurring.

Peacock feathers are actually brown, but have microscopic structures that interfere with light that make the bright iridescence.

Structural coloration is the production of colour by microscopically structured surfaces, sometimes also called schemochromes, fine enough to interfere with visible light, sometimes in combination with pigments: for example, peacock tail feathers are pigmented brown, but their structure makes them appear blue, turquoise, and green, and often they appear iridescent.

Structural coloration was first observed by English scientists Robert Hooke and Isaac Newton, and its principle – wave interference – explained by Thomas Young a century later. Young correctly described iridescence as the result of interference between reflections from two (or more) surfaces of thin films, combined with refraction as light enters and leaves such films. The geometry then determines that at certain angles, the light reflected from both surfaces adds (interferes constructively), while at other angles, the light subtracts. Different colours therefore appear at different angles.

In animals such as on the feathers of birds and the scales of butterflies, interference is created by a range of photonic mechanisms, including diffraction gratings, selective mirrors, photonic crystals, crystal fibres, matrices of nanochannels and proteins that can vary their configuration. Many of these mechanisms correspond to elaborate structures visible by electron microscopy. In plants, brilliant colours are produced by structures within cells. The most brilliant blue coloration known in any living tissue is found in the marble berries of Pollia condensata, where a spiral structure of cellulose fibrils produces Bragg’s law scattering of light.

Structural coloration has potential for industrial, commercial and military application, with biomimetic surfaces that could provide brilliant colours, adaptive camouflage, efficient optical switches and low-reflectance glass.

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A cesium atom in an atomic clock beats over nine billion times a second.

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And all I can grow is my hair and my fingernails...

The hydra, which is related to the jellyfish, can grow its body back in a couple of days if it is cut in half

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Japanese research concludes that drinking is awesome!

Japanese research has concluded that moderate drinking can boost IQ levels

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In space, astronauts cannot cry, because there is no gravity, so the tears can't flow.

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Every person has a unique tongue print.

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Einstein couldn't speak fluently when he was nine. His parents thought he might be retarded.

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