No Calculator? No Problem! Mastering Mental Math , award-winning professor of mathematics and celebrated “mathemagician” Arthur T. Benjamin delivers 10 fun-filled lessons on how to do math in your head with confidence, accuracy, and speed - sometimes faster than a calculator. By the end of Professor Benjamin’s lessons, you’ll be able to add, subtract, multiply, and divide numbers faster than ever before. And with your newfound skills, you’ll soon find yourself amazing other people and, perhaps more important, yourself.

Leap of Power, written by psychologist and author Robert Schwebel, offers a fully articulated and proven programmatic alternative to the millions of adults who have a substance use disorder, and to their friends and families, and to the professionals who provide counseling to them. It casts a wide net with a welcoming and nonjudgmental tone, and is filled practical advice about how people can and do take control of their lives, including their use of alcohol and other drugs.

Why are we devastated by a word of criticism even when it’s mixed with lavish praise? Because our brains are wired to focus on the bad. This negativity effect explains things great and small: why countries blunder into disastrous wars, why couples divorce, why people flub job interviews, how schools fail students, why football coaches stupidly punt on fourth down. All day long, the power of bad governs people’s moods, drives marketing campaigns, and dominates news and politics.