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Known as the centromere, the middle space between the two arms of the Y chromosome is key to its health.

Yet military hardware, so essential for security 50 years ago, is no longer the only form of security threat that matters.

He said that SARS is a common threat faced by the humankind. China's work is of uttermost importance in prevent the spreading of SARS.

But he said that farm output would be substantially stronger after bountiful monsoon rains, which are crucial for agriculture.

But the early years of a career are also essential and could influence pay down the road.

And although the Fed is still going to have more tools available to it, it is critical that the other branches of government step up.

Robert Kennedy, JFK's attorney general, was an important part of the back-channel negotiations that got us off the hook.

He said it was vital that information published should be accurate, rather than prompt but imprecise.

How much copper will the world's largest copper importer export? That counterintuitive question is critical to the outlook for the metal.