[nmarinov]

The first mention of this indeed does not specify that both are odorless but the second sentence does:

> Before playing the game, the participants sniffed either female tears or a saline solution – both are odorless – but were not told what they were sniffing.

[mcpackieh]

If both are actually odorless then what's the mechanism? Magic?

Obviously if there is any effect then the tears aren't actually odorless.

[exizt88]

Carbon Monoxide is odorless, but it’s effects are still real and well-understood.