The history of life on Earth is punctuated by what researchers call the "Big Five" mass extinctions, a group that includes the dinosaur-killing Cretaceous-Tertiary extinction and several other, even more severe, events.
Even more troubling, several economists said, there is no obvious engine to drive a recovery.
They make up a quarter of the voting-age population nationally, and even more in several swing states, including Nevada.
Even more interesting, several years later Chiron began to display a cometary coma even though it was still very far from the Sun.
But a wireless network can do even more, allowing several people to share a single printer, trade files or play games against one another on their PC's.
N.F.L. teams have almost never brought up workers' compensation — hoping to avoid even more claims, several lawyers said — so long-retired players can file for injuries sustained decades ago.
That support became even more solidified several months later when Newark's Mayor, Sharpe James, brought together a number of Essex County Democrats to deflate a trial balloon by Senator Robert Torricelli, who was threatening to run for governor race against Mr. McGreevey.
On Tuesday, they got even more ammunition: Several of Mr. Gore's comments in his debate with Gov. George W. Bush set off a fresh outcry over what even some of his supporters acknowledge is a tendency to embellish anecdotes about his roles in events.
In China, the market is even more tough, several photo and video applications like Camera360, LemeLeme, Tuding etc already claim millions of users.
That apparent contradiction makes these cases even more difficult, several officers said.
