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When using the materials, the nature of the concepts used in that sense "displace" the our basic understanding of their behavior. You can perform tests to characterize the materials and components, but there are some general considerations that are taken for granted before any measurement to be performed. Are common experiences that pulling a rubber band, it is thin, or that a ray of light, penetrating into a material such as glass of a lens, or a liquid such as water, deflected (refracted) into the material itself, or even that a droplet of water on the surface of a material with a more or less spherical, which would allow a degree of cohesion with the surface, so condensarvisi. If you know more about the materials, in particular their electromagnetism, you will also remember other properties: for example in an electrical conductor (eg copper) or a natural magnetic material (ferromagnetic or, for example, iron), the same applied electric or magnetic field, what is transmitted respectively depends on the electric permittivity (ε, epsilon) and magnetic permeability of the material (μ, mu).

However, more recently, it was discovered that there are materials that also have the opposite behavior than the logic: the materials auxetici, we talked about above, and swell when pulled, the film based on the lotus has a negative surface tension and are therefore self-cleaning; opal at certain frequencies has a negative refractive index, then it means that the light beam at certain frequencies out of the material and is rejected (by a circuitous route rather than linear in reality). There are also materials such as in the figure, which have negative electric permittivity and magnetic permeability, so that the electric or magnetic field are reflected in practice, rather than transmitted by the material. This is very different from having the insulation, or dielectric, materials that are only bad conductors, and with high losses (but also with a certain transmission) because it gives you a real total shielding of certain frequencies. These solutions

contrary to the logic design can be generically referred to as metamaterials (beyond the materials), which can also be interpreted as meaning that depend on micro-or nanostructure materials that have, in addition to the material (it is clear that the square spiral material in the figure is the key to its operation as a metamaterial).

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Screws, temperalapis


One thing we take for granted is screwed by a twisting of the wrist. This is because the screws have a thread worm, helical, as for example through screws, which are then stopped by a nut or a nut-washer or conical spiral as the screws wood.
The vines are a very ancient history, which begins, he says, Archytas of Taranto, in the fourth century BC, and continues with the Archimedean screw or a screw, which, obviously with very different sizes, was used (and needed) to extract water, but with similar principles, still need to drill the ground. And is not that the drill bit, aside from its greater speed, has a different shape.
This is part of a more general concept, which is typically biomimetic. The nature of work self-assembling materials with helical structures, ie spiral (in the photo you see the spiral fibrils that detach from the plant tissue with the edge of the celery), then the lives of Archytas, having forare il legno, non poteva far altro che proporre un movimento elicoidale, che si adattasse alla disposizione della microstruttura del materiale. Non è un principio poi così strano: una delle macchine primitive che tuttora utilizziamo molto, il temperalapis, è basata sullo stesso principio, quello di applicare una forza di torsione per tradurla in un taglio effettuato con una lama orizzontale (e non è un caso, perché la matita è di legno).
Nel caso del temperalapis come della vite, la forza necessaria al taglio od alla perforazione dev'essere ottimale nè troppo alta, il che danneggerebbe la struttura, né troppo bassa, nel qual caso l'operazione non riuscirebbe.