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How do TV or Radio stations know what their listening or viewer numbers are? Is it all an estimate?
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Activated charcoal says to place in the sun for an hour, and to repeat it once a month to 'reactivate' it. How does this work?
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How do TV or Radio stations know what their listening or viewer numbers are? Is it all an estimate?
1
--
10
9
8
7
6
5
4
3
2
1
0
Activated charcoal says to place in the sun for an hour, and to repeat it once a month to 'reactivate' it. How does this work?
1
--
10
9
8
7
6
5
4
3
2
1
0
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