abrasion wear
31Apollo/Skylab A7L — Apollo 11 A7L space suit worn by Buzz Aldrin, and another worn by photographer Neil Armstrong in the visor reflection. The A7L Apollo Skylab spacesuit is the primary pressure suit worn by NASA astronauts for Project Apollo, the three manned… …
32industrial polymers, major — Introduction chemical compounds used in the manufacture of synthetic industrial materials. In the commercial production of plastics, elastomers, man made fibres, adhesives, and surface coatings, a tremendous variety of polymers are… …
33Motorcycle safety — US Navy motorcycle training at …
34SCA fencing — is the style of fencing practiced by the Society for Creative AnachronismOverviewIn 1979 the Society for Creative Anachronism (SCA) introduced rapier rules, allowing fencing within the organization. Since that time, fencing has gained a… …
35Motorcycle personal protective equipment — A motorcyclist wearing helmet, gloves, boots and leathers slides along a racetrack after crashing …
36Spirit rover — (MER A) Artist s concept of Rover on Mars Operator NASA Mission type Rover Launch date …
37Leather — For other uses, see Leather (disambiguation). Modern leather working tools Leather is a durable and flexible material created via the tanning of putrescible animal rawhide and skin, primarily cattlehide. It can be produced through different… …
38Cast iron — For cookware, see Cast iron cookware. Iron alloy phases Ferrite (α iron, δ iron) Austenite (γ iron) …
39Bruxism — Infobox Disease Name = PAGENAME Caption = DiseasesDB = 29661 ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = 001413 eMedicineSubj = eMedicineTopic = MeshID = Bruxism (from the Greek βρυγμός (brugmós), gnashing of teeth ) is the grinding of the teeth,… …
40sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …
