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.
Lawrence sees no problem with the recommendation that women take 4,000 IU of vitamin D daily during pregnancy, although she says the impact of high doses of vitamin D on pregnancy-related complications remains to be proven. Four thousand IU may sound outrageous to some, but I believe it is really not unreasonable, she says.