They do know that certain things can trigger an attack, like air pollution, cigarette smoke, mold, pets, dustmites and cockroaches.
And while scientists still don't know what causes the disease, they believe common irritants found in homes across the country can trigger an attack.
Xolair is a monoclonal antibody to IgE that works like a Star Wars missile defense for allergies, binding to and inactivating excess IgE before it can trigger an attack.
The first is to create super moves, hitting the right trigger to add damage to an attack.
But the United Nations' secretary-general, Kofi Annan, wrote to Mr Allawi, President George Bush and the British prime minister, Tony Blair, arguing that the attack could trigger an all-out boycott of the election by Sunnis, and therefore undermine its legitimacy.
In a warning to Israel earlier this week, Hezbollah chief Hassan Nasrallah said his militia "is ready and has its hand on the trigger" in the event of an Israeli attack on any targets in Lebanon.
In a crisis, the temptation would always be to hold these missiles on a hair trigger, to be launched on warning of an incoming attack rather than lost to an enemy strike.
The initial trigger for the attack on Mr Yunus was a documentary screened on Norwegian television in November, which dredged up an old controversy about the use of development funds provided to Grameen by Norad, the Norwegian aid agency, in the 1990s.
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To trigger a melee attack, we simply moved the gun's end towards the screen as if we were bashing an opponent.
In healthy people, an adrenaline surge can trigger irregular heart rhythms and in those with heart conditions, the surge could trigger a heart attack.
Ancient peoples tended to locate us, that is the structures which make up the limbic system, in the stomach, because the hormonal responses we trigger divert resources away from the digestive system, which is not critical in an emergency, towards the muscles used to attack or run away.
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