About smell :
"In 2021, inhalation of hexadecanal was found to reduce aggression in men but to trigger aggression in women.[4] Hexadecanal is one of the most abundant substances emitted by human babies from their heads, which may be an evolutionary survival mechanism to induce mothers to defend the baby and fathers to not attack it. But it is not yet known whether the amount of hexadecanal emitted by humans is sufficient to affect other humans." https://en.m.wikipedia.org/wiki/Hexadecanal