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When the universe was several hundred thousand years old, matter and energy decoupled, allowing the radiation to escape, expand and cool off.
Hip Flexor
A group of muscles near the hip that are involved in moving the upper leg towards the body.
Semitendinosus
A muscle in the thigh that helps to flex the knee and extend the hip.
Rectus Femoris
One of the four quadriceps muscles of the thigh, it extends the knee and helps flex the hip.
Epicranius
A muscle of the scalp consisting of the frontalis and occipitalis, which raise the eyebrows and move the scalp.
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