Doogolas33

For instance: It was self evident that heavier than air vehicles could never fly until one day they did.

This is obviously false. Every single animal that flies is literally heavier than air. There was never, ever a reason, even a long, long time ago, to believe that any kind of flying machine would not be "heavier than air."

That's not what the person to whom you're replying said.

Here's a weird question, I'm super loud. Like, by a wide margin, I am naturally the loudest person I know. I'm also a teacher. One day, another teacher wanted to see how loud I was, so they got a decibel reader thing. And apparently during lessons I sit around 100dB. (Thankfully I don't lecture too long)!

Does that mean that you'd be able to hear me when I hit that threshold, or is it more complex than that, and my guess would be, very dependent on things like pitch?