paper dust
61Air filter — An air filter is a device which removes solid particulates such as dust, pollen, mold, and bacteria from air. Air filters are used in applications where air quality is important, notably in building ventilation systems and in engines, such as… …
62Nuclear winter — For other uses, see Nuclear winter (disambiguation). Nuclear weapons History Warfare Arms race Design Testing …
63Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
64Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
65Collapse of the World Trade Center — Coordinates: 40°42′41.12″N 74°00′44.00″W / …
66List of street names of drugs — This is a list of street names of commonly used recreational drugs. Such names vary according to location, and tend to change over time. Many names are used to describe several different recreational drugs. Contents 1 List of street names of… …
67Picture book — A picture book is a popular form of illustrated literature mdash;more precisely, a book with comparatively few words and at least one picture on each of its openings mdash;popularized in the 20th century Western world. The illustrations in… …
68Red rain in Kerala — From 25 July to 23 September 2001, red rain sporadically fell on the southern Indian state of Kerala. Heavy downpours occurred in which the rain was coloured red, staining clothes with an appearance similar to that of blood.cite web | last =… …
699/11 Truth movement — Supporters of the 9/11 Truth movement at a Los Angeles demonstration, October 2007 9/11 Truth movement is a collective name for loosely affiliated organizations and individuals who question the accepted account of the September 11, 2001,… …
70Space debris — populations seen from outside geosynchronous orbit (GEO). Note the two primary debris fields, the ring of objects in GEO, and the cloud of objects in low earth orbit (LEO) …
