Today we're talking about the ancestral shape hypothesis. Basically the theory proposed that our spines were made for walking on four legs as our ancestors did for 100s of millions of years before us. But when we transitioned to walking on two legs relatively recently, our spines weren't prepared for the new stresses placed on it leading to range of problems like disc herniations. We'll also explore some of the mechanisms by which disc herniations happen by learning about concepts like Laplaces law and lordosis.

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