Cylindrical "forearms" house small electric motors, known as actuators, which pull on metal tendons that move the fingers with precision.
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What this means for the web
Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.