A Crumpled Tissue
Xiang Kun closed his eyes and focused on sensing the tissue's location. That faint, almost nonexistent scent gave him an incredibly clear direction.
This was highly abnormal!
Like sound and light, scents also required a process of transmission.
Generally speaking, scents traveled far more slowly than light or sound.
However, scents were more likely to cling to and linger on things in nature, which made them easier to track.
But for a scent to cling and remain, there had to be a certain concentration of odor molecules. Otherwise, it simply would not be enough for the olfactory organs to detect.
Xiang Kun's sense of smell was far stronger than an ordinary person's—stronger even than a hunting dog's.
But that tissue had originally been unscented, so its odor was already weak, with few odor molecules capable of triggering an olfactory response. There were also unused tissues in the apartment, and their scent could easily interfere.
Normally, even if that tissue were hidden somewhere in his home, he might not have been able to trace it accurately by scent alone.
And now, the tissue had not only been packed into a garbage bag, but thrown into a trash bin full of heavily interfering odors.
By this time, it should indeed have been loaded onto a garbage truck and taken out of the residential complex.
Logically, there was no way the tissue's scent could have traveled here along its route.
Moreover, generally speaking, unless the scent source was very strong and the tracker was within its direct range, it was difficult to determine the exact location of the final scent source immediately from just a trace of odor.
Just like when he had tracked down Ms. Yang's lost husky before, he had followed one scent-marked point after another, linking them