While testing some new equipment, Neal Patwari of the University of Utah in Salt Lake City discovered that breathing actually affects Wi-Fi signal strength. He came to this conclusion after noticing variations in wireless signal strength in certain parts of a room that were seemingly triggered by chest movements. To prove his theory, Patwari placed 20 in-expensive wireless units around an occupied bed which were arrayed so that they sent 2.4 GHz waves across the sheet, but with one-thousandth the power of a laptop's wireless card.
2DayBlog.com, Wireless network can be used to track your in-house movements
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