Popular Mechanics inspires, instructs and influences readers to help them master the modern world. Whether it’s practical DIY home-improvement tips, gadgets a

Always study with the most up-to-date prep! Look for Let's Review Regents: Earth Science--Physical Setting Revised Edition, ISBN 9781506264646, on sale January

There are 100 quizzes of 10 questions each, graded and colour-coded for difficulty. You can use these to test what you already know about the Earth and the Univ