First there was Schrödinger's Cat, now there's Schrödinger's dollar.
Schrödinger's Cat is a thought experiment developed by physicist Erwin Schrödinger and used to illustrate the random quality of quantum mechanics. Imagine, he said, a cat in a box with a vial of poisonous gas and a bit of radioactive material, such as uranium. Uranium emits alpha particles, but at random intervals. A Geiger counter placed inside the box detects when an alpha particle is emitted. If one is detected, the poisonous gas gets released and the cat dies. If the Geiger counter doesn't detect a particle, the cat lives.
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A mathematical formula describing this experiment says that there is not a definite state (dead or alive), but two states that have a certain probability. The "real" state is known only when someone opens the box and looks in on the cat. This paradox has been explored by physicists for decades.
To explore this thought experiment, conceptual artist Jonathon Keats built a box, but instead of putting a cat inside, he put money. Keats, who is known for combining art and science, calls the box a "quantum ATM."