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.
It's in a part of the brain called the hypothalamus, which makes a hormone called CRH, or corticotropin-releasing hormone. Sternberg says that when you are stressed, you are bathing yourself in a whole soup of other nerve chemicals and hormones.