preliminary etching
21Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …
22Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals …
23Charles V, Holy Roman Emperor — Charles V Holy Roman Emperor; King of the Romans; King of Italy Reign 28 June 1519 – 27 August 1556[1] …
24Rongorongo — Infobox Writing system name = Rongorongo type = Undeciphered time = Time of creation unknown, most tablets lost or destroyed in the 1860s languages = Assumed to be Rapanui sample = Rongorongo Qr3 7 color.jpg iso15924 = RoroRongorongo… …
25Stardust (spacecraft) — Infobox Spacecraft Name = Stardust Caption = Artist s conception of the Stardust spacecraft Organization = NASA Jet Propulsion Laboratory Major Contractors = Lockheed Martin Mission Type = Fly by, sample collection Satellite Of = Sun Orbital… …
26Jean-Baptiste-Camille Corot — Portrait of Corot by Nadar. Date unknown. Birth name Jean Baptiste Camille Corot Born Jul …
27Perfluorooctanoic acid — IUPAC name pentadecafluorooctanoic acid …
28Wilhelm Leibl — (October 23,1844 – December 4, 1900) was a German realist painter of portraits and scenes of peasant life. Leibl was born in Cologne and in 1861 began his first training with Hermann Becker, a local painter. He entered the Munich Academy in 1864 …
29The Potato Eaters — Original title, in Dutch: De Aardappeleters Artist Vincent van Gogh Year 1885 Type Oil on canvas …
30Dental implant — Intervention A Straumann brand root form endosseous dental implant placed in the site of the maxillary left permanent first molar with bone graft used to elevate the sinus floor …
