I’m lighter than air but a million men can’t lift me. What am I?

Answer: bubble

More What am I ? with answers

More What am I ?

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I'm red but I can be green at times and I am even yellow. What am I?
I'm simple for a few people. But hard for them to hear. I live inside of secrets. I bring people's worst fears. What am I?
I'm smaller than a mouse, but I can fill a whole house. What am I?