The sunglasses come off when things get serious! The first statement "√2 is irrational" is basic math knowledge - no biggie. But mention that "a² = 2b² is insoluble in integers" and suddenly we're in mind-blown territory. What's the joke? These statements are actually equivalent! The irrationality of √2 means precisely that the equation a²=2b² has no integer solutions (where a and b have no common factors). Leopold Kronecker, the mathematician referenced in the title, was famously obsessed with integers, once declaring "God made the integers, all else is the work of man." He'd definitely appreciate this integer-focused humor!