Assigning strings to questionLeft over and over again

It happens because the the variables updates only when compiler runs on the code line by line. I mean, if you want to update the value of questionsLeft, you need to call the line of definition each time and assign the decreased number of questions. In other words compiler doesn't know to put the new number of questions in the questionsLeft variable until it will run the line again.

You could probably achieve that with a function or a loop. But there's no such functionality in this program. All we're doing is allowing the programming to run in its normal flow; that is running each statement from top to bottom.

So you have to explicitly give each variable it's new values then display it again.. It's the completely opposite to the DRY philosophy in programming but then, we haven't yet been in introduced to the functions stage of the course. :-)

(I'm very much a beginner, so someone correct me if I'm wrong!)

"Isn't it supposed to remember it throughout the document ?" That's right, it does! But only the first time its used. That is, it's being "set" once and then remembers that value. Take the following as an example:

var x = 3;
var y = "Eat " + x + " apples a day!";
console.log(y);
x = 2;
y = "Eat " + x + " apples a day!";
console.log(y);

We'll see the console print out "Eat 3 apples a day!". If we then update x to hold 2, and invoke a console.log for y again, it will still only remember that x was set to 3. That's as far as it knows, because it was set only once on line 2. In order for us to "refresh" it that x has changed to 2, we'll need to set the variable again, so it can look for x once more and then set itself accordingly.

I hope I was clear enough. I also hope I was right :) But this is how I understand it.