Total volume of the Great Lakes

Your estimate:

10,000 to 25,000 cubic miles

Correct answer:

22,684 cubic miles

Uhhhh... pretty sure I was right and it marked it wrong.

---

Also, I think that marking answers right or wrong is the incorrect way to measure this. By deeming it right or wrong, you are making it trivia rather than estimation.

For instance, I estimated that Alexander the Great was born between 300 BCE and 100 BCE, it was marked wrong but the right answer is 356 BCE. That is a fairly accurate estimation still.

You should get rid of the Buzzfeed-esque "number people got right" and move towards measuring mean percent off from the correct answer so you could say like "Most people are within 30% of the right answer" or something like that. You should also make it where you can't game it by doing something like 0 to 100,000,000,000,000,000 and being told you are right: https://i.imgur.com/Ysnz1gr.png ;)