Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 61 · Episode 3 ·
Secrets of The Brain (1)
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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Episode 3 of season 61 of Horizon: “Secrets of The Brain (1)”. Aired 2025-09-29. Watch it online free on ZapFlix.