In a fascinating twist of fate, Millennials might just be the smartest generation alive today, having largely escaped the cognitive detriments of leaded gasoline and the pervasive influence of AI-driven social media during their developmental years. This intriguing perspective was highlighted in a recent podcast by economist Tim Harford, who noted that exposure to leaded gasoline in childhood lowered IQ scores by about five points for those affected.

This issue was particularly severe for children growing up in the United States during the 1960s and 1970s, when the use of leaded gasoline peaked. Research published in the Proceedings of the National Academy of Sciences pinpointed those born in the mid-to-late 1960s as the most impacted, with an average loss of six IQ points due to the inhalation of lead-laced auto exhaust. Leaded gasoline, introduced in 1923, wasn't completely banned until 1996, long after its initial dangers were known.

Millennials, born from 1981 to 1996, were fortunate enough to miss the worst of this lead exposure. Moreover, they were the last generation to grow up without the ubiquitous presence of smartphones and sophisticated social media algorithms that dominate today's childhood environment. Studies have shown that excessive screen time can significantly impair cognitive development in children, a concern that is only escalating as technology becomes more ingrained in daily life.

The impact of this technological immersion is evident as children’s scores in fundamental areas like math and reading have seen declines correlating with the rise of smartphone and social media use since around 2013. Millennials, in contrast, completed much of their cognitive development before these technologies became central to modern life, potentially giving them a cognitive edge over subsequent generations.

Despite clear warnings from the past and present about the dangers of environmental toxins—whether lead or digital—the response has been frustratingly tepid. Historical records show that as early as 1925, the harmful effects of leaded gasoline were recognized, yet its use continued for decades. Today, we face a similar battle with the unregulated, profit-driven use of screen and social media time, which is shaping up to be just as damaging for current and future generations.

This generational advantage that Millennials seem to hold isn't just a stroke of luck; it's a call to action. It illustrates the ongoing need to balance technological advancement with health and cognitive wellness, a balance that is currently skewed heavily in favor of short-term profits over long-term health. As we continue to understand more about these impacts, perhaps the fortunate cognitive status of Millennials can serve as both a blueprint and a cautionary tale for how we handle environmental and technological hazards moving forward.