Google must be following my surfing habits. "how to be happy" came fourth, under "how to bake salmon" and "how to block a number".
Interestingly enough "how to be emotionally available" was first. Ouch!
P.S. My daughter asked Siri if she wanted to have our obnoxious dog, and the response was "I don't have many 'wants'!" Kudos for the programmers!