Horizon - Season 61 - Eps 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?
About Horizon

Title: Horizon
First Air Date: 1964-02-04
Last Air Date: 2025-08-18
Status: Returning Series
Rating: 7.4/10 (from 33 votes)
Language: EN
Seasons: 62
Total Episodes: 1170
Network: BBC Two
Genres: Documentary
Production Companies: Unknown
Synopsis
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.