Horizon S61E03 · Secrets of The Brain (1)

Overview

Theoretical physicist Professor Jim Al-Khalili goes on a journey through 600 million years of evolution to uncover how the human brain, the most complex structure known in the universe, came to exist. With some 100 billion neurons and over 100 trillion connections - more than all the stars in the Milky Way - the human brain is one of nature's greatest achievements. But how did something so incredibly sophisticated evolve from its simple beginnings?

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Episodes

1. 1 1. Confessions of a Brain Surgeon2025-08-18 · 58mTop brain surgeon Henry Marsh is facing his own life-threatening diagnosis. He reveals the huge risks and emotional impact of a job filled with difficult life-and-death decisions.
2. 2 2. Disease X: Hunting the Next Pandemic2025-09-22 · 58mVirologist Dr Chris van Tulleken embarks on a global investigation into the hunt for the pathogen that could trigger the next pandemic and the cutting-edge science developed to tac
3. 3 3. Secrets of The Brain (1)2025-09-29 · 58mTheoretical physicist Professor Jim Al-Khalili goes on a journey through 600 million years of evolution to uncover how the human brain, the most complex structure known in the univ
4. 4 4. Secrets of the Brain (2)2025-10-06 · 58mJim watches primates in action to see how they tackle survival challenges, revealing the clever tricks that shaped the brain's thinking. But the real breakthrough came when brains