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A tetrahedron can be placed in 12 distinct positions by rotation alone. These are illustrated above in the cycle graph format, along with the 180° edge (blue arrows) and 120° vertex (reddish arrows) rotations that permute the tetrahedron through the positions. The 12 rotations form the rotation (symmetry) group of the figure.
Julian Voss-Andreae :
Heart of Steel (Hemoglobin) (2005)
Quantum Man
Molecular diffusion/Diffusion is an example of the law of large numbers, applied to chemistry. Initially, there are solute molecules on the left side of a barrier (purple line) and none on the right. The barrier is removed, and the solute diffuses to fill the whole container. Top: With a single molecule, the motion appears to be quite random. Middle: With more molecules, there is clearly a trend where the solute fills the container more and more uniformly, but there are also random fluctuations. Bottom: With an enormous number of solute molecules (too many to see), the randomness is essentially gone: The solute appears to move smoothly and systematically from high-concentration areas to low-concentration areas.
Racetrack in Conway's Game of Life. Legend: * Green structure : Gun * Yellow structure : Glider * Red structure : Spaceship * Violet structure : Reflector * Blue structure : Eaters (both as still lives and oscillators) and others still lives.
c:User:Kelvin13/Portfolio
Sun poster
A more complete and sophisticated moon diagram
Poster showing the structure and features of europa.
Diagram of the internal structure of Ganymede.
C4 photosynthesis is really complicated. Microscope picture is my own work.
Kunstformen der Natur : book of lithographic and autotype prints by German biologist Ernst Haeckel.
Cantino planisphere (or Cantino World Map) is the earliest surviving map showing Portuguese geographic discoveries in the east and west.
Stylized world map in the shape of a clover-leaf (the three classical continents of Europe, Asia, Africa), with Jerusalem at the center, with additional indication of Great Britain, Scandinavia and America / the New World.
Abraham Ortelius (Ortels, Orthellius, Wortels; 1527.04.4 or 14 – 1598.06.28): Brabantian cartographer, geographer, and cosmographer, conventionally recognized as the creator of the first modern atlas, the Theatrum Orbis Terrarum (Theatre of the World).
Theatrum Orbis Terrarum
Ortelius World Map Typvs Orbis Terrarvm , 1570.
The Great Wave off Kanagawa (Literally: "Under a Wave off Kanagawa"), by Katsushika Hokusai.
Tōkaidō Shinagawa Goten'yama no Fuji, Goten-yama hill, Shinagawa on the Tōkaidō, by Katsushika Hokusai.
Ejiri in Suruga Province, by Katsushika Hokusai.
Zhao Mengfu (1254–1322), Autumn colors on the Qiao and Hua mountains (left half, cropped)
H. R. Giger's Birth Machine sculpture in Gruyères, Switzerland
Baltics in the 13th century (German map)
Cartoon map showing the political situation in Europe in 1877.
The Avenger: An Allegorical War Map for 1877. This map reflects the "Great Eastern Crisis" and the subsequent Russo-Turkish War of 1877-78.
Competences of the European Union in relation to those of its member states [ 2]
The Union has exclusive competence to make directives and conclude international agreements when provided for in a Union legislative act as to …
Member States cannot exercise competence in areas where the Union has done so, that is …
Union exercise of competence shall not result in Member States being prevented from exercising theirs in …
research, technological development and (outer) space development cooperation, humanitarian aid
The Union coordinates Member States policies or implements supplemental to their common policies not covered elsewhere in …
The Union can carry out actions to support, coordinate or supplement Member States' actions in …
the protection and improvement of human health industry culture tourism education , youth, sport and vocational trainingcivil protection (disaster prevention) administrative cooperation