I draw in and push out endlessly, I keep life moving without thought, I can be felt but not seen. What am I?
Category: Brain · Difficulty: medium
Hint: Consider air movements inside mechanical devices
Answer
An engine’s cooling airflow
Explanation
Engine cooling systems circulate air continuously to manage heat, felt but invisible.
This is a medium brain riddle — a moderate challenge for most people. The answer is An engine’s cooling airflow.
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