paper dust
71Depleted uranium — The DU penetrator of a 30 mm round[1] Depleted uranium (DU; also referred to in the past as Q metal, depletalloy, or D 38) is uranium with a lower content of the fissile isotope U 235 than natural uranium (natural uranium is about 99.27% uranium… …
72environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …
739/11 conspiracy theories — The collapse of the two World Trade Center towers and the nearby WTC7 (in this photo, the brown building to the left of the towers) is a major focus of 9/11 cons …
74Lead paint — is paint containing lead, a heavy metal, that is used as pigment, with lead(II) chromate (PbCrO4, chrome yellow ) and lead(II) carbonate(PbCO3, white lead ) being the most common. Lead is also added to paint to speed drying, increase durability,… …
75Comet Hale–Bopp — C/1995 O1 (Hale–Bopp) Discovery Discovered by: Alan Hale and Thomas Bopp Discovery date: July 23, 1995 Alternate designations: The Great Comet of …
76Fomalhaut — This article is about the star. For the extrasolar planet, see Fomalhaut b. Fomalhaut Debris ring around Fomalhaut showing location of planet Fomalhaut b imaged by Hubble Space Telescope s coronagraph …
77Le Sage's theory of gravitation — is the most common name for the kinetic theory of gravity originally proposed by Nicolas Fatio de Duillier in 1690 and later by Georges Louis Le Sage in 1748. The theory proposed a mechanical explanation for Newton s gravitational force in terms… …
78Vacuum cleaner — Cylinder vacuum cleaner for home use. French train vacuum cleaner …
79Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …
80Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
