“What is sentimentality? Is it a manipulation tactic, a type of emotion – the desire to be overwhelmed mixed with self-regard – or an overwrought response to a trigger? What factors predispose you to it: youth or age, a gene, a gender, a mood, an IQ score? Is sentimentality useless or precious? … Why does weeping in the darkness of the theater feel so lovely? Why does clicking on an Upworthy link feel so wrong?”