We trace the arc of quantum tunneling from alpha decay and solar fusion to engineered giant quantum states in Josephson junction circuits. We unpack the 2025 Nobel‑winning work showing a macroscopic object tunneling through a barrier and exhibiting discrete energy levels, laying the groundwork for superconducting qubits and quantum engineering. Along the way, we ask what it would mean if other everyday, large systems secretly obey quantum laws waiting to be revealed.

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