TOEFL 5lb Book of Practice Problems
TOEFL 5lb Book of Practice Problems

Author: Manhattan Prep

Publisher: Simon and Schuster

Published: 2017-11-07

Total Pages: 1345

ISBN-13: 1506218725

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Manhattan Prep’s TOEFL 5 lb. Book of Practice Problems is an essential resource for students of any level who are preparing for the TOEFL. With more than 1,500 questions across 46 chapters in the book and in online resources, TOEFL 5 lb. provides students with comprehensive practice. Developed by our expert instructors, the problems in this book are sensibly grouped into practice sets and mirror those found on the TOEFL in content, form, and style. Students can build fundamental skills in Reading, Listening, Speaking and Writing through targeted practice, while easy-to-follow explanations and step-by-step processes help cement their understanding of the concepts tested on the TOEFL. In addition, students can take their practice to the next level with online question banks that provide realistic, computer-based practice to better simulate the TOEFL test-taking experience. Purchase of this book includes access to additional online resources and practice.

Exploration of Halley’s Comet
Exploration of Halley’s Comet

Author: Michael Grewing

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 1005

ISBN-13: 3642829716

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The 1985/86 apparition of Halley's Comet turned out to be the most important apparition of a comet ever. It provided a worldwide science community with a wealth of exciting new discoveries, the most remarkable of which was undoubtedly the first image of a cometary nucleus. Halley's Comet is the brightest periodic comet, and the most famous of the 750 known comets. With its 76-year period, its recent appearance was truly a "once-in-a-lifetime" observational opportunity. The 1985/86 apparition was the thirtieth consecutive recorded apparition. Five apparitions ago, the English astronomer Edmond Halley discovered the periodicity of "his" comet and correctly predicted its return in 1758, a triumph for science best appreciated in the context of contemporary views, or rather fears, about comets at that time. The increasingly rapid progress in technological development is very much apparent when one compares the dominant tools for cometary research during Halley's next three apparitions: in 1835 studies were made based on drawings ofthe comet; in 1910 photographic plates were used; while in March 1986 an armada of six spacecraft from four space agencies approached the comet and carried out in situ measurements, 1 AU from the Earth. In 1910, nobody could have dreamed that this was possible, and today it is equally difficult to anticipate what scientists will be able to achieve in 2061.