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The Heart of Mathematics: An Invitation to Effective Thinking, 4th Edition
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He is both well liked and very intelligent. He is also very rich. I consider his annual “Chairman’s Letter” (in the Berkshire annual report) to be indispensable reading for anyone wanting to do well in business.
Rabbi Daniel Lapin • Thou Shall Prosper: Ten Commandments for Making Money
Bill Thurston writes:
Mathematics is a process of staring hard enough with enough perseverance at the fog of muddle and confusion to eventually break through to improved clarity.
Andy Matuschak • Cultivating Depth and Stillness in Research

When I come across interesting information, I underline then write a corresponding question in the margin. So what I underlined is an answer to the question.
Billy Oppenheimer • The Notecard System: Capture, Organize, and Use Everything You Read, Watch, and Listen To
Ross Honsberger, Mark Biass, and Greg Walsh shared, it was that they were each more knowledgeable than Frank about something he wanted to know more about.