Intermediate Word: 
  (a) complete accounting  (b) compact summary  (c) interim peace treaty  (d) pocket-sized handbook
Difficult Word: - trrituration  (a) grinding into a fine powder  (b) splitting land into three parcels  (c) trisecting an angle  (d) separating by skimming off a lighter layer

Puzzling Filaments in Milky Way Explained - Space.com   The filaments range from 10 to 100 light-years in length and 1 to 3 light-years across. They occur only in a very narrow area, within about 900 light-years of the galactic center, a region crowded with old and new stars. The filaments emerge from pockets of intense star formation, the new study found. The center of the Milky Way is dominated by a supermassive black hole, which is surrounded by an intense magnetic field and pockets of rampant star formation. 
Major Galactic Mystery Solved By CU Astronomers - SpaceDaily  Researchers at the University of Colorado at Boulder have solved a major galactic mystery that may help astronomers in their quest to develop a detailed picture of the chemical evolution of the Milky Way galaxy. Speaking at the 204th meeting of the American Astronomical Society held May 30 June 3 in Denver, the researchers reported that the abundance of deuterium, a heavy form of hydrogen, in the Milky Way galaxy today shows a consistent pattern that can be simply explained, lifting a veil of uncertainty that has long plagued astronomers. "For astronomers to be able to answer questions such as whether life exists elsewhere, we have to understand the whole picture of the chemical abundances in galaxies, and measuring deuterium is our best test," Linsky said. 

Yale Scientists Visualize Molecular Detail Of RNA Splicing Complex - SpaceDaily  Scientists in the department of molecular biophysics and biochemistry at Yale revealed the crystal structure of the first described enzymatic RNA - what it looks like and how it reacts - in the journal Nature. Scott Strobel, professor and principal investigator of the study and his research team at Yale, used X-ray crystallography to image the self-splicing group-I intron and the associations it makes as it reacts. The image shows an interaction with metal ions and the alignment of the RNA molecule segments. 

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