Secrets of the Brain (2)

6.8/10 · 8 votesOct 6, 202558 min

Ranked #4 of 4 in Season 61•−0.1 vs season avg

Discussion

Jim 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 learned to be social. Teaming up with his wife, Jim investigates how relationships and friendships made people

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Season 61 Episodes4

E1 6.9

Confessions of a Brain Surgeon

E2 7.0

Disease X: Hunting the Next Pandemic

E3 7.0

Secrets of The Brain (1)

E4 6.8Now viewing

Secrets of the Brain (2)

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Episode Summary

"Secrets of the Brain (2)" is episode 4 of Horizon season 61. It scored 6.8/10 from 8 votes, ranking #4 of 4 episodes this season (season average 6.9). It aired on October 6, 2025.

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