Seth Shostak Quotes
Odors can be highly transitory, depending on the air currents. If this is happening in your house, ask if there are any possessions of that deceased loved one still around. If it happens elsewhere, consider just how many millions of people use the same perfume or smoke the same brand of cigar as someone you knew.
Citations
Shostak, Seth. "Six Reasons to Be Skeptical of Ghosts." HuffPost, 26 Oct. 2012.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.