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21Tunguska event — The Tunguska Event, or Tunguska explosion, was a powerful explosion that occurred near the Podkamennaya (Lower Stony) Tunguska River in what is now Krasnoyarsk Krai of Russia, at around 7:14 a.m. [P. Farinella, L. Foschini, Ch. Froeschl eacute;,… …
22Canoe — A canoe is a small narrow boat, typically human powered, though it may also be powered by sails or small electric or gas motors. Canoes usually are pointed at both bow and stern and are normally open on top, but can be covered. In its human… …
23Polystyrene — For other uses, see Polystyrene (disambiguation). Expanded polystyrene packaging …
24Designer toys — is a term used to describe toys and other collectibles that are produced in limited editions (as few as 10 or as many as 2000 pieces) and created by artists and designers. Designer toys are made of variety of materials; ABS plastic and vinyl are… …
25Polyethylene terephthalate — PETE redirects here. For the first name, see Peter (disambiguation). For other uses, see Pete (disambiguation). Polyethylene terephthalate fibre IUPAC name …
26Indigenous Australians — This article is about the original inhabitants of Australia. For the Australian definition in law, see Australian Aborigines. Australian Aboriginals and Torres Strait Islanders …
27Materials science — Simulation of the outside of the Space Shuttle as it heats up to over 1,500 °C (2,730 °F) during re entry into the Earth s atmosphere Materials science is an interdisciplinary field applying the properties of matter to various areas of… …
28Petrochemical — Petrochemicals are chemical products made from raw materials of petroleum or other hydrocarbon origin. Although some of the chemical compounds that originate from petroleum may also be derived from World production of ethylene is around 110… …
29Injection molding — (British: moulding) is a manufacturing process for producing parts from both thermoplastic and thermosetting plastic materials. Molten plastic is injected at high pressure into a mold, which is the inverse of the product s shape. After a product… …
30Cannabis (drug) — Marijuana redirects here. For other uses, see Marijuana (disambiguation). For the plant genus, see Cannabis. Cannabis …
