You are wrong: if your scale is adequately precise, there is a measurable difference.

I spend roughly two hours a day selling online. I clear about $40 an hour. I'm satisfied with that.

Yes, and Yes. The first will cause a great deal of concern for the taxpayers the first time we send a spacecraft to the outer Solar Systme.

If time is relative, and Santa is magical, then Santa has all the time in the world to deliver the presents.....and that time to him might seem to take weeks and weeks, but to the world all of the presents are delivered in the same split second.

This also explains Calvinism.

No, I think you have it reversed: they experience darkness, so they know what it is. It's light they can have no concept of. It's like your nerves constantly sending signals to your brain: you know what sensation is, so try to imagine no sensation whatsoever: you can't.

No, I'd think they don't know what light is, but darkness they experience every day, so they would know what darkness is.