We're in the middle of another 5-day trivia hunt! For those who missed yesterday's challenge, it's not too late. Be sure to solve it right over here.

The rules: Every day this week, I'll be presenting a specific challenge. Your job: come up with the answers and hold onto them! Why? Because on Friday, you'll need them to solve a short puzzle. The first person to email in the correct answers and successfully show how you arrived at them (thus the title: How Did You Know?) wins a choice of any t-shirt and book from our store.

As always, I definitely encourage you to work in teams. Email your friends, send around each daily challenge, conspire, work together, whatever it takes to make sure you're armed with the right answers going into Friday's puzzle.

Today, I've got a bunch of questions for you dealing with the diagram below.
Make sure you click through all the pages and answer all the questions, and see you back again tomorrow for challenge No. 3!


Question 1) What is the diagram called?
Question 2) What is the sum?
Question 3) What is the order?
Question 4) What is the number that goes in the blank box?