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Scientists have developed many theories about the origin of HIV and AIDS since that deadly disease first came public in the early 80’s. This mysterious disease have been the main subject around the world for over 25 years. But no one really knows the truth of what really cause that illness and where exactly did it come from?

People and Scientists from around the globe have tried to give the best explanation of the sudden appearance of The HIV virus.  Some suburban legend theorizes that the virus came from space, when the USA’s first space shuttle came back to earth, April, 14, 1981. But as we all know there aren't any proofs to validate those claims.

Let’s clarify some points before we get to the core of the subject—the HIV or (the Human Immunodeficiency Virus) and the AIDS (Acquired immune deficiency syndrome) are two different thing. You may have the HIV virus in your system, but you don’t have the disease called AIDS. And furthermore there is no valid proof that the HIV virus causes AIDS.

The main differences between the HIV virus and the illness called AIDS are the following:

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·         HIV is a lentivirus, and like all lentiviruses they attack your immune system. Those lentiviruses have been found in many animals such as horse, cat, and sheep. But the most resemblant to the HIV virus is the SIV (Simian Immunodeficiency Virus) virus which affects monkeys

·         AIDS is the disease contracted after the HIV virus has completely destroyed most of your immune system.

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A person can have the HIV virus, and look healthy for many years; because the HIV virus is a slow or (lentivirus) virus which means it takes a long time to have effects on your body. When someone is contaminated with the HIV virus, it reduces your immune system ability to fight off illness and other viruses.

The most common theories of the HIV virus is the "HUNTER" .

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Source: http://www.avert.org/origin-aids-hiv.htm
Should we be concerned about solar storms in 2012? Heliophysicist Alex Young from NASA Goddard Space Flight Center sorts out truth from fiction. Credit: NASA/Goddard/SVS

Given a legitimate need to protect Earth from the most intense forms of space weather – great bursts of electromagnetic energy and particles that can sometimes stream from the sun – some people worry that a gigantic "killer solar flare" could hurl enough energy to destroy Earth. Citing the accurate fact that solar activity is currently ramping up in its standard 11-year cycle, there are those who believe that 2012 could be coincident with such a flare.

But this same solar cycle has occurred over millennia. Anyone over the age of 11 has already lived through such a solar maximum with no harm. In addition, the next solar maximum is predicted to occur in late 2013 or early 2014, not 2012.
Most importantly, however, even the biggest solar flares are not powerful enough to physically destroy Earth.

This is not to say that space weather can't affect our planet. The explosive heat of a solar flare can't make it all the way to our globe, but electromagnetic radiation and energetic particles certainly can. Solar flares can temporarily alter the upper atmosphere creating disruptions with signal transmission from, say, a GPS satellite to Earth causing it to be off by many yards. Another phenomenon produced by the sun could be even more disruptive. Known as a coronal mass ejection (CME), these solar explosions propel bursts of particles and electromagnetic fluctuations into Earth's atmosphere. Those fluctuations could induce electric fluctuations at ground level that could blow out transformers in power grids. The CME's particles can also collide with crucial electronics onboard a satellite and disrupt its systems.

In an increasingly technological world, where almost everyone relies on cell phones and GPS controls not just your in-car map system, but also airplane navigation and the extremely accurate clocks that govern financial transactions, space weather is a serious matter.

But it is a problem the same way hurricanes are a problem. One can protect oneself with advance information and proper precautions. During a hurricane watch, a homeowner can stay put . . . or he can seal up the house, turn off the electronics and get out of the way. Similarly, scientists at NASA and NOAA give warnings to electric companies, spacecraft operators, and airline pilots before a CME comes to Earth so that these groups can take proper precautions. Improving these predictive abilities the same way weather prediction has improved over the last few decades is one of the reasons NASA studies the sun and space weather. We can't ignore space weather, but we can take appropriate measures to protect ourselves.

And, even at their worst, the sun's flares are not physically capable of destroying Earth.

For more information concerning 2012, visit
› 2012: Beginning of the End or Why the World Won't End? 

Source : http://www.nasa.gov/topics/earth/features/2012-superFlares.html


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    March 2012