What can’t be seen, can’t be felt, can’t be heard, and can’t be smelt, but can kill you if ignored?

Category: Brain · Difficulty: medium

Hint: It's often a danger in homes.

Answer

Poisonous fumes

Explanation

Carbon monoxide is a colorless, odorless gas that is toxic.

This is a medium brain riddle — a moderate challenge for most people. The answer is Poisonous fumes.

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