Why did evolution invest so much energy into thinking when most animals survive just fine without it? Why do some species with massive brains struggle at tasks that smaller-brained animals solve easily?

The story of intelligence isn’t a straight line and it definitely isn’t about brain size alone.

In this episode, I’m joined by Dr. David Bainbridge, a reproductive biologist and comparative anatomist at the University of Cambridge, to unpack what evolution actually optimized for and what it didn’t. We explore how brains evolved across millions of years, why intelligence shows up in wildly different forms across species, and how humans ended up taking an especially strange evolutionary path.

We dive into why vertebrate brains share a common blueprint, how mammals and birds reorganized that blueprint in completely different ways, and why humans ended up paying such a massive energy cost for cognition. Along the way, we challenge the idea that intelligence has a single definition and question whether the human brain is a triumph of evolution or a risky experiment that happened to work.

If you’re curious about evolution, intelligence, or why the human mind feels both powerful and fragile, this episode will change how you think about what the brain is and why it exists at all.

Hosted by Avanish Srinivasan. Learn more at youngaxons.com.