Everything Alive Started as One Cell

This video explains how every living thing descended from a single ancestor, using evidence you can actually see rather than abstract theory. It opens with a genuine engineering flaw — a nerve that loops five metres out of its way in a giraffe, and takes the same pointless detour in you — then lays out evolution's single rule (imperfect copying + inheritance + a world that kills unevenly) and shows it running in real time: finches whose beaks measurably changed in two years, and gut bacteria that gained a brand-new ability after decades in a lab. From there it zooms out to the shared genetic code that links bacteria, oak trees and humans, walks through fish crawling onto land and whales walking back into the sea, and ends where it began — with the leftover "souvenirs" every human still carries. The throughline: evolution has no destination, only a past and whatever pressure is on it now.