@chessforeverything said in #1:
> Which month has 28 days?
> It's so simple, but it's NOT what you think.
"has" and "days" could be interpreted in so many ways. Let's look at "has":
"has" could be used to indicate that something has a definitive amount of something but also to indicate that it has a certain but we don't know how much more it has. It could also be a typo for Hass Avocados, and in the sentence "which month avocado 28 days", months can't avocado. Therefore, your question can even be considered invalid.
Now let's look at "days":
"Days" could mean an Earth day, but it could mean a Moon day, Sun day, or even the infinite day of the sun-facing side of a tidally locked planet. And the list is not limited
Furthermore, we have to consider relativity effects. When you're going near light speed, a day for you can be more than a day in the outside world. And since you don't know how fast you're traveling and which point of reference you're getting a day length from, we can get various values. Furthermore, being near a black hole has similar effects as well due to the extreme gravity, so since this further is not mentioned, we get even more answers.
Therefore, we have 3*infinity = infinity answers.
Now what? All of our answers are correct.
