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.
1 A toxic reaction to a single sting or bite. 2  Spiders or insects that may cause this include: 3  Black widow spider. 4  Brown recluse spider. 5  Scorpion. 6  Puss caterpillar (woolly slug). 7  A toxic reaction to multiple stings or bites from a bee, wasp, or fire ant. 8  A bee leaves its stinger behind and then dies after stinging. Serum sickness, a reaction to the medicines (antiserum) used to treat a bite or sting. 2  Serum sickness may cause hives and flu-like symptoms about 3 to 21 days after the use of antiserum. 3  A virus infection. 4  Infected mosquitoes can spread the West Nile virus to people, causing an inflammation of the brain (encephalitis).