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One hundred fifty years ago, do you know how many of those man-made signals there were in our environment?
Zero
Seventy-five, do you know what percentage of signals are in our environment compared to now?
10%
Twenty-five years ago?
30%
Studies of long-term effects of all this low-frequency electromagnetic radiation are ongoing. We may not know the effects for another twenty-five years. It may be nothing, it may be very damaging, we just don't know.
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