It bleeps for 100m years or so, gradually slowing down and fading away until its pulses are no longer strong enough to detect.

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And what can happen is that everybody's memories of the devastation start fading away, and then pretty soon people are asking: Why are we giving money to Haiti?

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More and more parents, he says, are living away from their children and the practice of children taking care of elderly parents is fading.

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