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.
Many insects and spiders bite or sting, and while the bites of common bugs like mosquitoes, mites, and fleas are itchy and uncomfortable, they're usually otherwise harmless. But some bites and stings, like those from fire ants, wasps, hornets, and bees, may cause intense pain or even an allergic reaction.