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Williams describes it as looking for a “Goldilocks zone.”

"Iodine disrupts the intermolecular bonds holding sulfur molecules together by just the right amount to lower its melting point to the Goldilocks zone -- above room temperature yet low enough for the cathode to be periodically re-healed via melting."

For the past 10,000 years humans have lived in a “Goldilocks Zone” where Earth’s temperature variations were relatively stable.

The Rwanda bill must be in the "Goldilocks zone" between being "tough enough", abiding by international law and being acceptable to Rwanda, Home Secretary James Cleverly has said.

The planet is in what astronomers call ''the Goldilocks zone' - the right distance away from its star for the surface temperature to be neither too hot, nor too cold, but just right for there to be liquid water, which is essential to support life.