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"Our study adds to a growing body of work suggesting that vaccines may play a role in healthy aging strategies beyond solely preventing acute illness," study author Eileen Crimmins, of the University of Southern California, said.
The Natterer's come out a little later, preferring to exit through small holes in the roof to get outside and find food.
But if Venezuela's oil output does eventually surge, could it bring global oil prices down? Analysts refuse to be drawn.