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The high tanks held 10,000 nanograms of caffeine per litre and the low tanks held 100, two levels chosen because both occur in real rivers. There was no caffeine-free group at all, so what the experiment measures is the distance between those two numbers.

A ship that exceeded every safety rule of its time still couldn't save everyone—a gap that would reshape maritime law forever.
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Space, science, and the human side of the frontier. Since 1995.
Space Daily is an independent publication covering three connected beats: the space industry, the science behind it, and the psychology of ambition, isolation, and meaning under extremes. Founded in Tokyo in 1995, we’ve built a thirty-year archive of rigorous reporting on the people, missions, and ideas pushing humanity outward — and on the human dynamics shaped by frontier life. The same ambitions, pressures, and patterns of mind that drive humanity to the stars also shape how we live on Earth. We employ modern AI technologies to support our editorial workflows; every published piece is editorially directed and reviewed.
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