A Reddit post on the subreddit Showerthoughts compares the long lifespan of dinosaurs to the relatively short lifespan of humans. The post highlights the fact that dinosaurs existed for almost 200 million years without achieving human-level intelligence, while humans have only existed for 200,000 years but have developed significant intelligence. The post then ponders the uncertain future of humanity, questioning if we will be able to survive for as long as the dinosaurs. The comments section of the post engages in a lively debate about the nature of intelligence, the potential for intelligence in other species, and the long-term survival of both humans and dinosaurs.