Johanson describes the revelation of Lucy's knee, stating, "It really showed us without a doubt that the skeleton was, like the knee, fully upright - walking like we do." This was unexpected as Lucy had a small brain.
He points out the significant shift in understanding evolution, saying, "The find essentially flipped the narrative of evolution on its head, highlighting that traits like bipedalism and brain size developed independently."
Johanson emphasizes, "Even Darwin, way back in the 1870s, suggested that upright walking and larger brains were linked. Lucy disproves this, showcasing independent evolution of traits."
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