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.
Both of which are localized skin infections/inflammations. A spider bite could occur on back but is less likely. A spider bite could get infected or it could cause tissue necrosis as with the brown recluse spider bites. became quite ill from it. Luckily, most people do not have this severe a reaction. Brown recluse bites can cause minor reactions or they can in rare cases be deadly. Hemotoxic venom is injected when they bite. In one study, over a third of bites led to necrosis (destruction) of the skin surrounding it.