Color: Many Colors (opal changes color) Opal, the only gem that doesn't fit into any single description of a precious stone, is the birthstone for October. It is said that no two opals are exactly alike. But it is sensitive to moisture and is more fragile than its fellow gemstones. It displays a brilliant array of colors which dazzle the eye.
1: When you are faced with stressful situations, cortisol, epinephrine, and norepinephrine are released by your. kidneys.
Though the stress hormone cortisol is very well studied, this is just part of the picture, as there is a simultaneous activation of the sympathetic nervous system that stimulates an increased output of catecholamines (epinephrine and norepinephrine) in both the brain and the adrenal medulla.