This adorable kids' book lets boys know tough guys have feelings, too.

Feelings: Everybody has 'em. Even superheroes.

As his young son grew older, a deep-rooted concern began nagging at Keith Negley — an anxiety many parents can probably relate to.

When something would embarrass or upset Negley's son, Parker — on the playground or the soccer field, for instance — Parker would grapple with how to show his feelings.

Sometimes, his emotions would manifest as anger or hostility. Other times, "he'd just shut down altogether," Negley explained to Upworthy.

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You may have heard $75,000 is the magic household income for happiness.

But what, exactly, does that mean?

In a landmark study a few years ago, Princeton University researchers Angus Deaton and Daniel Kahneman set out to definitively answer the question of whether money buys happiness. If anyone is equipped to answer that question, it's these two. Both have won the Nobel Prize in economic sciences: Kahneman in 2002 and Deaton just last year in October 2015.

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