angular closure
21Physical 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… …
22Caudata — ▪ amphibian order Introduction also called Urodela, one of the major extant orders of the class Amphibia. It includes salamanders (salamander) and newts (newt). The relatively small and inconspicuous salamanders are important members of… …
23Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …
24Veterinary surgery — is surgery performed on animals by veterinarians. Most veterinarians perform surgery, but it is also possible to specialize in surgery by becoming board certified.The goal of veterinary surgery may be quite different in pets and in farm animals.… …
25Lake Dolores — is the original, given name of the man made lake(s) as well as the surrounding site where stands a still physically existent, though currently inoperative waterpark on Hacienda Road in the desert town of Newberry Springs, San Bernardino County,… …
26speech disorder — n. any conspicuous speech imperfection, or variation from accepted speech patterns, caused either by a physical defect in the speech organs or by a mental disorder, as aphasia, stuttering, etc. * * * ▪ medicine Introduction any of the… …
27Mathematical formulation of quantum mechanics — Quantum mechanics Uncertainty principle …
28Wassily Kandinsky — Wassily Kandinsky, c. 1913 or earlier Birth name Wassily Wassilyevich Kandinsky Born 16 December [O.S. 4 December] 1866 Moscow …
29Space rendezvous — A space rendezvous is an orbital maneuver during which two spacecraft, one of which is often a space station, arrive at the same orbit and approach to a very close distance (e.g. within visual contact). Rendezvous requires a precise match of the… …
30Beijing Ancient Observatory — The Beijing Ancient Observatory (zh tsp|t=北京古觀象台|s=北京古观象台|p=běi jīng gǔ guān xiàng tái) is a pretelescopic observatory located in Beijing, China. The revolutionary tools used within this ancient observatory were built in 1442 during the Ming… …
