Scientists claim to have found the two types of water that explain the liquid’s oddness

Despite being the most familiar liquid, water is weird. It breaks many of the usual rules that govern the liquid state. In 1992 a team of researchers suggested why that is. Perhaps, they said, there are two types of liquid water, which become distinct only at temperatures well below freezing point, where it’s all but impossible to keep water liquid.¹ Researchers have sought evidence for this bold conjecture ever since – and now an international team claims to have found it.