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2. Portable desk - Wikipedia

   en.wikipedia.org/wiki/Portable_desk

   Most portable desks gradually disappeared during the 19th century, as useful day-to-day writing tools. The introduction of mass literacy during that period, the invention of cheaper and more efficient writing implements, and the mass production of furniture made most portable desks redundant. With the advent of clean writing surfaces in every ...

3. Hand tool - Wikipedia

   en.wikipedia.org/wiki/Hand_tool

   A hand tool is any tool that is powered by hand rather than a motor. [1] Categories of hand tools include wrenches, pliers, cutters, files, striking tools, struck or hammered tools, screwdrivers, vises, clamps, snips, hacksaws, drills, and knives . Outdoor tools such as garden forks, pruning shears, and rakes are additional forms of hand tools.

4. Cleaning symbiosis - Wikipedia

   en.wikipedia.org/wiki/Cleaning_symbiosis

   Cleaning symbiosis is a mutually beneficial association between individuals of two species, where one (the cleaner) removes and eats parasites and other materials from the surface of the other (the client). Cleaning symbiosis is well-known among marine fish, where some small species of cleaner fish, notably wrasses but also species in other ...

5. Ichthys - Wikipedia

   en.wikipedia.org/wiki/Ichthys

   Ichthys was adopted as a Christian symbol.. The ichthys or ichthus (/ ˈ ɪ k θ ə s /), from the Greek ikhthū́s (ἰχθύς, 1st cent.AD Koine Greek pronunciation: [ikʰˈtʰys], "fish") is (in its modern rendition) a symbol consisting of two intersecting arcs, the ends of the right side extending beyond the meeting point so as to resemble the profile of a fish.

6. Chemical toilet - Wikipedia

   en.wikipedia.org/wiki/Chemical_toilet

   A chemical toilet collects human excreta in a holding tank and uses chemicals to minimize odors. They do not require a connection to a water supply and are used in a variety of situations. These toilets are usually, but not always, self-contained and movable. A chemical toilet is structured around a relatively small tank, which requires ...

7. Cleaner fish - Wikipedia

   en.wikipedia.org/wiki/Cleaner_fish

   Cleaner fish. Cleaner fish are fish that show a specialist feeding strategy [1] by providing a service to other species, referred to as clients, [2] by removing dead skin, ectoparasites, and infected tissue from the surface or gill chambers. [2] This example of cleaning symbiosis represents mutualism and cooperation behaviour, [3] an ecological ...