We’ve all been there: it’s 90 degrees outside, absolutely sweltering, and you’re walking home from a new smoothie shop less than a mile away from your apartment, and everything is melting. The smoothie in your right hand. The açaí bowl in your left. Your old, broken headphones slowly slip off your head as a song you’ve never heard before blares through the speakers. Your willpower is diminishing by the second, and no one is around to help you.

Okay, that might be a bit specific (and precisely what happened to me not too long ago). Still, you’ve likely had a similar experience: an encounter that left you annoyed, frustrated, or feeling hopeless.

But what if I told you that, according to Mo Gawdat, a former Google executive who has spent the last 20 years researching the mechanics of happiness, you only need to endure that emotional roller coaster for precisely 90 seconds?

Meet the man behind the 90-second rule

It’s time to meet the man who is revolutionizing our understanding of our emotions by giving us all a science-backed way to hit the reset button on our worst days.

Mo Gawdat isn’t your typical wellness guru peddling crystals and manifestation journals. This is a guy who spent years as Chief Business Officer at Google X, the company’s “Moonshot Factory,” where he pursued ambitious, high-risk but potentially world-changing projects that tackled large-scale global problems like climate change, healthcare, and communications. But his most profound discovery about human happiness stemmed from his darkest hour.

When Gawdat’s 21-year-old son Ali died from preventable medical negligence during what should have been a routine surgery in 2014, he faced a darkness that would define the rest of his career. A clear choice emerged. He could either let this grief consume him, or honor his son by dedicating his analytical mind to a path Ali had always encouraged him to pursue: spreading happiness to as many people as possible.

Seventeen days after losing his son, Gawdat sat down and began writing Solve for Happy: Engineer Your Path to Joy. Through this book, he uncovered a revolutionary truth: our emotions aren’t permanent. They have expiration dates.

The brain science behind your emotional meltdowns

Here’s where things get fascinating. When developing what would later be known as the “90-second rule,” Gawdat stumbled upon the findings of Harvard-trained........

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