If it reaches a temperature that is too low, it automatically turns the heat up again, eliminating the need for a human to wait for it to reach boiling point and monitor whether it stays there.

CNN: Sensor keeps cooking on the boil

They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

ECONOMIST: Flood barriers

Though the temperature at which this effect occurs is too low for it to have any obvious practical consequences for the operation of computer chips, it is hot stuff for the theorists.

ECONOMIST: Superconductors