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00:00Why do we say to have a blue fear?
00:02It is not by chance that the color blue was chosen to describe a great fear or a great fear.
00:08The formula to have a blue fear appeared during the 19th century.
00:12The origin of this expression comes more precisely from the medical field.
00:16Indeed, when the human being feels a sudden and violent fear,
00:20he is able to find himself in apnea and hold his breath for several seconds.
00:25The human body reacts in turn since apnea leads to a lack of oxygen in the blood,
00:30which then begins to change color.
00:32And this lack of oxygen can in turn generate physical signs.
00:35The lips and nails can indeed turn blue.
00:38Feeling a vivid emotion like fear can therefore make certain parts of the body glow
00:43and that is why we say to have a blue fear.