The Nothing That Has the Potential to Be Anything

Quantum mechanics reveals that even completely emptied space contains unavoidable "zero-point energy" - a residual energy that exists because the Heisenberg uncertainty principle prevents particles from having both precise position and velocity simultaneously. This energy, first identified by Max Planck in 1911, explains why atoms vibrate even at near absolute zero temperatures and creates measurable effects like the Casimir force between metal plates, but paradoxically doesn't produce the massive gravitational effects physicists would expect.