self-cleaning filter
41David Irving — For other uses, see David Irving (disambiguation). David Irving …
42Sherkin Island — (from the Irish Inis Earcáin ) lies southwest of County Cork in Ireland alongside other islands of Roaringwater Bay. It has an average population of 100 people, measures 3 miles long by 1.5 miles wide (5 km by 3 km). The island has a primary… …
43Air pollution — from World War II production Smog over …
44Hair care — is an overall term for parts of hygiene and cosmetology involving the hair on the human head. Hair care will differ according to one s hair type and according to various processes that can be applied to hair. All hair is not the same; indeed,… …
45Comparison of analog and digital recording — This article compares the two ways in which sound is recorded and stored. Actual sound waves consist of continuous variations in air pressure. Representations of these signals can be recorded using either digital or analog techniques. An analog… …
46Lubricant — A lubricant is a substance introduced to reduce friction between moving surfaces. It may also have the function of transporting foreign particles and of distributing heat. The property of reducing friction is known as lubricity. A good lubricant… …
47Uranium mining — The Ranger Uranium Mine in Australia …
48papermaking — [pā′pər māk΄iŋ] n. the making of paper papermaker n. * * * pa·per·mak·ing (pāʹpər mā kĭng) n. The process or craft of making paper. paʹper·mak er n. * * * Introduction formation of a matted or felted sheet, usually of cellulose fibres,… …
49Radio-controlled car — HPI E Savage, Tamiya Wild Willy 2, Kyosho Mini Z Monster, and Team Losi Micro T Radio controlled (or R/C) cars are self powered model cars or trucks that can be controlled from a distance using a specialized transmitter. The term R/C has been… …
50Activated carbon — Activated carbon, also called activated charcoal, activated coal or carbo activatus, is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions …
