““To date we know only two real media that offer almost no resistance to moving bodies. One such medium was discovered in the 1930s: If we cool down helium, a noble gas, to temperatures close to absolute zero, it will flow through the thinnest of tubes with almost no friction. This phenomenon is called superfluidity. Another substance that shows superfluidity is a rare isotope of the same element, called helium-3. It takes experience to explore all the facets nature offers us. No form of logic can replace it.””
