Water is the most naturally abundant and widely used extinguishing substance. It extinguishes fire by cooling. There are three main types of water deluge systems, components of which are shown below. From left to right, they are: fine water spray systems, sprinkler systems, and water spray systems.
Vitamin D, a steroid hormone that influences virtually every cell in your body and has been positively linked to health conditions ranging from cancer to heart disease, may significantly boost fertility in both men and women.
1 Women over 50 need 2.4 micrograms (mcg) of vitamin B 12 and 1.5 milligrams of vitamin B 6 each day. 2  Ask your doctor if you need a vitamin supplement. 3  After menopause, a woman's calcium needs go up to maintain bone health. 4  Women 51 and older should get 1,200 milligrams (mg) of calcium each day.