If tears are being detected by the brain, it's through chemicals from the tears traveling through the air and landing on sensors in your nose (or mouth); that is odor. If there is some mechanism other than odor by which humans might distinguish tears them from saline solution after sniffing them, please tell me.
Odors also being detected with your tongue is irrelevant trivia which doesn't alter my conclusion. Sound can be heard through your chest but that's irrelevant trivia when somebody says "if there's no air to transmit pressure waves to your ears then there's no sound." Sound is transmitted through pressure waves in the air, and odors are transmitted through chemicals in the air. If you're hearing them with your ears or chest or smelling them with your nose or mouth makes no difference, the fact that any detection is evidently taking place shows that there is sound or odor involved. Furthermore, the researchers obviously suspect that the mechanism of detection is odor because they asked their subjects to sniff it. You don't ask subjects to sniff a thing unless you suspect odor of being involved. If researchers were studying the perception of magnetic fields, they wouldn't ask people to sniff the fields.
Again, if there is any other plausible mechanism for detection, then tell me. Otherwise, stop wasting my time.
