Frequent measurements can freeze a quantum system's state and stop it from changing.

Imagine a spinning coin. If you slap your hand on it every millisecond, it never gets a chance to fall over. In physics, this is the Quantum Zeno effect. When scientists look at a quantum particle very rapidly, they force its wave-like state to reset. This constant resetting stops the particle from decaying or changing into another state. It keeps the particle exactly as it was, frozen in time by the simple act of watching.