why do some fish have more mercury than others

why do some fish have more mercury than others

: I know that large fish contain a lot of mercury, but where does it come from? And what are we doing to prevent this contamination? -- Alison Bronner, Atlanta, GA Mercury in the fish we like to eat is a big problem in the United States and increasingly around the world. Mercury itself is a naturally occurring element that is present throughout the environment and in plants and animals. But human industrial activity (such as coal-fired electricity generation, smelting and the incineration of waste) ratchets up the amount of airborne mercury which eventually finds its way into lakes, rivers and the ocean, where it is gobbled up by unsuspecting fish and other marine life. Once this mercury gets into the marine food chain, it bioaccumulates in the larger predators. That s why larger fish

 why do some appliances need thicker wire

why do some appliances need thicker wire

The wire gauge you need is a function of several things. The acceptable voltage drop or power loss (that appears to be the only thing considered in the website you linked). The voltage drop (and power loss) is proportional to wire length and inversely proportional to the cross-sectional area of the wire- in other words inversely proportional to the square of the wire diameter (assuming constant current). The acceptable temperature rise. This is a function of the number of current-carrying wires bundled together, the environment (maximum ambient temperature and air pressure or altitude, for example), the insulation type, the wire type (some types of wire are plated to withstand higher temperatures than bare copper without corroding). Regulatory requirements and other considerations- for

 why do sikhs go to the golden temple

why do sikhs go to the golden temple

The first gurdwara was built in, on the banks of in the region by the first Sikh guru, in the year 1521. It now lies in the of west Punjab (Pakistan). The worship centres were built as a place where Sikhs could gather to hear the guru give spiritual discourse and sing religious in the praise of. As the Sikh population continued to grow, the sixth Sikh guru, introduced the word gurdwara. The etymology of the term 'gurdwara' is from the words 'gur (аЕааЕ)' (a reference to the Sikh gurus) and 'dwara (аЕааЕаЕаЕ)' (gateway in ), together meaning 'the gateway through which the guru could be reached'. Thereafter, all Sikh places of worship came to be known as gurdwaras. , established in the 1490s by first Sikh Guru, Guru Nanak Dev, Punjab, Pakistan. , established in 1499 became the Sikh centre

 why do shrimp need to be deveined

why do shrimp need to be deveined

If you've (and ) at home recently, you may have encountered the quandary of whether or not to devein the shrimp. While most recipes call for shrimp to be peeled and deveined (removed of its intestinal tract), there are dissenters, like our very own PartySugar, who has learned from the Spanish that it's completely unnecessary to devein shrimp. So what's the real story? ...

 why do people only eat fish on good friday

why do people only eat fish on good friday

Those who grew up observing traditions of the Catholic Church will know all about the meat guilt on Good Friday. The more devout followers of the religion will have had this guilt probably every Friday, and many households will still observe a fishy Friday due to the Christian tradition. Abstinence from meat on Fridays is actually a rule laid out by the Vatican and remains in force today. Many Christians, especially Catholics, refrain from eating meat on Friday, and this tradition is most popular on Good Friday. Jesus was executed on Good Friday and died for our sins, he sacrificed his flesh for us. On the anniversaryВof Christвs death, the church encouragesВfollowers to abstainВfrom eating meaty flesh of warm-blooded animals on this day. People are told to go for the alternative which is

 why do painted lady caterpillars spin silk

why do painted lady caterpillars spin silk

The Painted Lady Butterfly is probably the most widespread butterfly in the world. It has no permanent residence and they are spotted across all the continents. The Painted PButterfly is found in Asia, Africa, Europe, and all over North America. The only place you won t find one is South America, the Arctic, and Australia. The Painted Lady prefers well-lit, open environments. Such as clover fields, flowery meadows, and hilly countryside. Marshes, sand dunes, and patches of thorn scrubs also draw them in. To try and attracted these butterflies you could try planting a buddleia plant near your. : Camouflage, cooling methods, and survival tactics. : View the Painted Ladys life history, territorial behaviour and population studies. The Painted Lady Butterfly anatomy is rather spectacular,

 why do we need government in india

why do we need government in india

This lesson introduces you to some of the basic ideas which were of great importance to the Founders. They used these ideas when they developed our government. You will learn why they thought we need a government in the first place. You will also learn how they believed governments should be created and what they ought to do. Think of a right you believe all people should have. For example, you probably agree that everyone in the United States has the right to be protected from robbers and burglars. The belief that everyone should have this protection is shared by most people in the United States. We hear about it on television, in the newspaper, and in discussions. Individually or in small groups, explain how you think rights like the one you have identified can be protected. Most people

 why do runners wear compression sleeves on their arms

why do runners wear compression sleeves on their arms

I have to laugh when I read the occasional post in a running forum that suggests that the only reason leading runners wear arm sleeves is because they are paid to. One recent poster said that he believed the only reason runners wear arm sleeves is to look chic. Running arm sleeves. Really? Really!!!!! Running Arm Sleeves Why do runners wear arm sleeves? Naturally, no two runners wear arm sleeves for the same reasons. Here are ten reasons why you see more and more runners opting to wear quality UV arm sleeves and calf sleeves. Reason #1: Safety, duh. What runner hasn't been nearly killed on account of a car, bus, or even a motorcycle not noticing them. Even when you try to exercise running awareness and safety, there are those on the road that are negligent in their driving. You need to

 why do we need to keep our body healthy

why do we need to keep our body healthy

A healthy body sets the stage for your day-to-day well-being and how well you will age. Maintaining fitness through good nutrition and exercise promotes efficient circulation, digestion and musculoskeletal strength. This allows you to live an active life, and a healthy immune system helps you ward off disease. According to the Centers for Disease Control and Prevention, healthy body benefits extend to mood elevation and greater mental alertness, as well as reduced chronic disease risk. When you keep your metabolism working well, you enjoy greater energy and fewer aches and pains. Adequate vitamins, minerals, dietary fiber, fatty acids and carbohydrates are needed to facilitate all of your body processes. Nightly rest periods allow your body to repair cells and perform other maintenance

 why do scars itch when they heal

why do scars itch when they heal

It's normal for them to itch for years. Here's a "medical" explanation: Wound healing is a very long and complex process which progresses in stages. Three stages of wound healing can be classified as: I. Inflamation; II. Proliferation; and III. Remodeling. These stages are fairly well understood and can be further broken down into specific cellular mechanisms that promote wound healing during each stage. The process can ultimately last for months or even years, depending on exactly where it is on the body, what type of tissue it is, and the kind of use that the tissue receives in terms of daily stretching and exposure to the environment. But in general, since sensation in and around the affected area comes from nerve endings (there are no nerve endings inside scar tissue. but there are

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