It doesn't even illustrate that particularly well. As is, the page just seems to be pointing at floating point and yelling "wrong", with no information on what's actually happening.

By all means embrace the surprise and educate today's 10,000, by why not actually explain why these are reasonable answers and the mechanics here behind the scenes?

I was one of those people today! This intrigued me enough to learn more about IEEE 754.

Thank you for the relevant xkcd!