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The technology of photography is part chemical, part optical, and dates from 1839. Soon after its simultaneous invention by William Henry Fox Talbot in England and Louis Jacques Mand? Daguerre in France, photography was applied to document foreign tourist destinations including India, the Holy Land, along with the American West. It was also used by portraits with photographs taken of kings, statesman, and theater or literary personalities. However the humans living for the spaceship were different to the humans who're living on the planet now. They were so fat that they are struggling to walk. they travelled around in motorised chairs with a monitor and cup & straw attached, chatting on phones and when they happened to fall out they just laid there until a robot came along and picked them up. The adults were fat, the children were fat! They just laid around all day consuming doing no exercise what so ever and to quote the captain, "Computer, define dancing". Food preservation involves treating and handling food with the idea to greatly slow or stop spoilage that caused or accelerated by micro-organisms. Preservation normally involves preventing the development of fungi, bacteria along with other micro-organisms, along with the oxidation of fats which the cause rancidity. However, many ways of preservation actually use benign fungi, yeasts or bacteria to preserve food and add specific qualities, by way of example wines or cheeses. It may also include processes which inhibit aging and discoloration that occur during cooking, much like the enzymatic browning (oxidation) in apples when they are cut. Some food has to be sealed after treatment to avoid recontamination with microbes while others, including drying, mean food can be stored without special containment. There are many methods of preserving food including freezing, freeze drying, spray drying, food irradiation, sugar crystallization, adding preservatives, preserving in syrup, canning an d vacuum-packing.