Virtual water. Virtual water trade (also known as trade in embedded or embodied water) refers to the hidden flow of water if food or other commodities are traded from one place to another. For instance, it takes 1,340 cubic meters of water (based on the world average) to produce one metric tonne of wheat.
At the same time, researchers also say poor understanding of truly dangerous spider bites delays treatment when a person really has been bitten by a dangerous spider. For example, the bite of the brown recluse spider can cause death of a sizeable area of skin (skin necrosis) resulting in a deep, scarring ulcer. Yet even in areas infested with brown recluse spiders, true bites are uncommon. The analysis is published in the July 14 online issue of The Lancet.
Doctors call this âanaphylaxis.â Rarely, a spider bite can cause an allergic reaction doctors call âanaphylactic shock.â It can be fatal. Call 911 if you have any of these symptoms: Rapid swelling of the lips, tongue, throat, or around the eyes. Difficulty breathing. Wheezing or hoarseness.