【Leadership】Why Top CEOs Choose a $1 Salary――Lessons on Long-Term Value and Leadership Mindset
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【Mathematics】High School Math for Global Business! Derivatives and Hydrofoil Speed Calculations (1)
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【Mathematics】The Collatz Conjecture Explained! Unsolved Math Mystery with 120M Yen Reward
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【Entrepreneurship】Solo-Entrepreneurship Insights from Kenta Katsuki: Freedom Beyond Earning
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【Knowledge】“masona” ― Your Portal for Knowledge, Growth, and Practical Wisdom
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【Finance】Income Gain vs. Capital Gain――The Smart Investor’s Guide to Building Wealth (Also Available in Spanish)
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【Finance】From Zero to FIRE! How Freelancers Turn Unstable Income into Lasting Wealth (Also Available in Spanish)
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【Greetings】For First-Time Guests:Hey world, meet “masona” — our new company and brand!
FIRE with Kids: How Financial Freedom Really Works When Family Comes First
【Marketing】The Core of Affiliate Marketing! Why Elegant Words Can’t Beat Content with Real Substance
【Mathematics】High School Math for Global Business! How to Maximize Values in Data Sets (5)
【Spotlight】What Sota Fujii Teaches Us About True Talent and Humility: The Power of an “Unexpected Blessing”
【Mathematics】High School Math for Global Business! Mastering the Marginal Rate of Substitution (MRS)――A High School Math Approach to Consumer Theory (4)
【Career】Step Confidently into Your Career: A Realistic Guide for Job Hunters Who Haven’t Found Their Dream Yet
【Education】Back to High School! A Grown Man’s Unexpected Victory in Japan’s English Proficiency Exam
【Mathematics】High School Math for Global Business! Mastering Marginal Utility with Partial Derivatives――A Simple Guide for Absolute Beginners (3)
【Policy】Why Japan’s National Health Insurance Feels Unfair――Insights for Freelancers and Healthy Individuals













































































