radioactive displacement law
41Operation Opera — For the Yugoslav Wars operation, see Operation Opera Orientalis. Babylon Part of Arab–Israeli Conflict Map of the attack …
42Electromagnetism — Electricity · …
43Kilogram — Kg redirects here. For other uses, see Kg (disambiguation). Kilogram A computer generated image of the international prototype kilogram (IPK). The IPK is the kilogram. The IPK, which is roughly the size of a golf ball, sits here alongside a ruler …
44Potential energy — This article is about a form of energy in physics. For the statistical method, see Potential energy statistics. Classical mechanics Newton s Second Law …
45Air pollution — from World War II production Smog over …
46Economic policy of Barack Obama — Main article: Political positions of Barack Obama Barack Obama s current economic advisors are Austan Goolsbee of the University of Chicago and Jeffrey Liebman of Harvard University.[1] In 2006, Obama wrote: We should be asking ourselves what mix …
47Supernova — This article is about the astronomical event. For other uses, see Supernova (disambiguation). Multiwavelength X ray, infrared, and optical compilation image of Kepler s supernova remnant, SN 1604. A supernova is a stellar explosion that is more… …
48test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …
49biblical literature — Introduction four bodies of written works: the Old Testament writings according to the Hebrew canon; intertestamental works, including the Old Testament Apocrypha; the New Testament writings; and the New Testament Apocrypha. The Old… …
50Perpetual motion — For other uses, see Perpetual motion (disambiguation). Robert Fludd s 1618 water screw perpetual motion machine from a 1660 wood engraving. This device is widely credited as the first recorded attempt to describe such a device in order to produce …
