Heisenberg's uncertainty principle, according to which nature is inherently indeterministic, implies an open future (and, for that matter, an open past).
The best clocks now scan a one-hertz-wide sweet spot to find its exact center, plus or minus one millihertz, in every single measurement—despite the Heisenberg limits.
Among his many revolutionary ideas, the most significant is undoubtedly the Heisenberg Uncertainty Principle, a concept that challenged traditional physics and created a new paradigm in quantum theory.
Would you prefer a simpler application of Heisenberg's uncertainty principle, in which I could either know where you are or whether I like you, but not both.
He is known for many breakthrough discoveries over the course of his career, and the Heisenberg Uncertainty principle is one of them, which he first published in 1927.