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From Zero to Dino-Roar: Teaching a T-Rex to Walk with MuJoCo and Reinforcement Learning

A deep technical walkthrough of building a biomechanically faithful T-Rex in MuJoCo and training it to balance, walk, and hunt through three-stage curriculum learning with PPO — achieving a 96.7% bite success rate on commodity GPU hardware. Covers MJCF model design, Gymnasium environment architecture, reward engineering with mathematical formulations, and real training results from the Mesozoic Labs open-source project.

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