May 15, 2026 10 min
Overview
What happens to lake water when it no longer freezes in winter? Detailed records of a "divine" freezing phenomenon of Lake Suwa in Japan have been kept for 580 years, but since 2018 it has not frozen. Corrected on May 19, 2026: the unit on the vertical axis of the graph at 8'10" has been changed to "mg/L".
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