It's a friendly metaphor, not real coffee. Each "coffee" is $5 and you can buy as many you like.
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About Nori Yamamoto
creating web apps, online courses, and molecular puzzle
大学教員。専門は計算化学。化学の学びを身近にすることにも興味を持っています。 I’m a chemist specializing in molecular simulation. Teaching and sharing the joy of chemistry have also been my passion.
