Season 61 Episodes4
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7.0
Secrets of The Brain (1)
7.0/10 · 9 votesSep 29, 202558 min
Ranked #2 of 4 in Season 61•+0.1 vs season avg
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
Seasons62
Episode Summary
"Secrets of The Brain (1)" is episode 3 of Horizon season 61. It scored 7.0/10 from 9 votes, ranking #2 of 4 episodes this season (season average 6.9). It aired on September 29, 2025.