acoustical image source
51Cosmic microwave background radiation — CMB and Cosmic background radiation redirect here. For other uses see CMB (disambiguation) and Cosmic background (disambiguation). Physical cosmology …
52building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
53HVAC — may also stand for High voltage alternating current. See also: Glossary of HVAC HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called… …
54Anthony Adducci — Infobox Person name = Anthony J. Adducci image size = caption = birth name = Anthony Joseph Adducci birth date = August 14, 1937 birth place = Chicago, Illinois death date = September 19, 2006 death place = Scottsdale, Arizona death cause =… …
55music, Western — Introduction history of Western music from ancient times to the present. All ancient civilizations entered historical times with a flourishing musical culture. That the earliest writers explained it in terms of legend and myth is… …
56University of California, Berkeley — Seal of the University of California, Berkeley Motto Latin: Fiat Lux Motto in English Let There Be Light …
57Hippopotamus — Hippo redirects here. For other uses, see Hippo (disambiguation). This page is about the species Hippopotamus amphibius. For the genus Hippopotamus, see Hippopotamus (genus). Hippopotamus …
58Kidney stone — Classification and external resources …
59Analog sound vs. digital sound — Analog sound versus digital sound compares the two ways in which sound is recorded and stored. Actual sound waves consist of continuous variations in air pressure. Representations of these signals can be recorded in either digital or analog… …
60John F. Kennedy Center for the Performing Arts — Kennedy Center redirects here. For the spaceport, see Kennedy Space Center Kennedy Center …
