re: Light speed Questions

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I'm not sure I am understanding. How is it possible to not be able to be a certain height?

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Technically it's impossible to be exactly anything because measurements aren't rational. If something is 6 feet in length, there are actually an infinite number of decimals involved. Either like 6.000000000001 or 5.9999999. There can be an infinite number of 9's, but you're still not quite 6 feet. We count and numbers are exact and finite, but in the real world there is no such thing, infinitely approaching that value is the best you can do.

It's like a ball being perfectly round; we know that if we look closely enough, there are always going to be parts that aren't. So if we measure something and it's 1 inch long, we always know that if we look and measure more closely, you can get more precise. So nothing is ever actually a concrete value.