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ethnic groups. The equipment we brought with us was quite complex, with a reduced volume. Arriving in the Earth proximity we had no idea about the plant morphology and animals we would find there. We knew that the intelligent message we received could only come from beings with human shape 1?, but we did not know, given the great variability of species in function of biogenetic laws, like what these people would look like. Without data on the planet geophysics, which determine the evolution profile of leaving species and whose law we know quite well, we did not know if our immune system could stand the bacterial aggressions. In prevision of such an eventuality we were clothed with a artificial epidermis, completely different of the clothing used by the terrians, which allows the sudation without letting chemical and biological products to get in. Near our natural orifices a series of devices had been placed, adapted to each organ function. Some capsules placed in our nasal fossae assured our oxygen alimentation from the transmutation of pure carbon. Our eyes and mouths were well protected. Our alimentation was given by a device located in the lumbar region and which could push the food through two pipes. The first brought some solid food, with the help of mechanical cilium, to a hole ending on our inferior lip. The food were contained in some capsules that our spittle could liquefy. This system was controlled by coded signals from the eyelid (it was enough to blink several times with the eyes, with a code) The second pipe was bringing liquids. The water was obtain mainly from the recycling of our urine after purification and enriching it with chemicals components. A rectal probe decomposed our stools in basic chemical elements. One part of those were gasified and transmuted into oxygen and hydrogen to synthetize water and compensate the loss to sudation. The rest was transmuted into helium, flowing outside. When we equipped so ourselves, the equipments are first put in place and the artificial epidermis is sprayed all over the body. We move perfectly free and we can evolve without risk in a biologically hostile area. Such an equipment may be completed with a new layer of metallized plastics, enforced with tiny meshes, which allows to move in the space vacuum when we visit, for instance an asteroid with no atmosphere. This clothing is then more rigid but do not handicap our movements. In addition to this individual equipments, we had brought with us some device to synthestize some carbonhydrats and other components of our basic alimentation from the gas elements of your planet, in case it 98