I spotted this in a BBC Horizon
episode, and it is a very common “error” based on a poor understanding of the concepts involved.
Speaking about inducing hypothermia
to patients in order to slow down the metabolic rate of brain cells (thus reducing oxygen requirements and consequently reduce rate of cell damage and death), the presenter said the following:
[...] bringing down the core body temperature to about 18 degrees [centigrade], less than half our normal temperature [37 centigrade].
So, can you spot the error??
[FWIW, this was a good Horizon episode, "Back from the Dead" although I felt it was too long for this subject...]