We're back with another 5-day trivia hunt!

To remind you of 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.

We're also adding some special prizes this time around for those who come really close, but don't get all the answers in time. And last month, we awarded some shirts and books to a couple contestants who impressed us with charts, diagrams, and other complex methods of recording and organizing the clues/answers. So we'll be on the lookout for the creative among you, as well. This is all to say: it pays to play whether you nab the grand prize or not.

As with previous How Did You Know? posts, comments have been turned off, but I definitely encourage you to work in teams. April's winner was the team of Bill Pearson and Adam Constable, who I know benefitted greatly from e-mailing each other throughout the week. So write 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.

If you missed Day 1's challenge, it can be found right over here, while Day 2 is right here.
Today we're playing One of These Things is not Like the Others, if you recall the Sesame Street game. Your job is pretty simple: on the following pages you'll find some images. They all have a lot in common, but there's one that's notably different from the others. Name it and tell us why it's different. And don't forget to see the hint on the last page for a clue to tomorrow's puzzle.

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Click here for a clue that will help you with tomorrow's challenge.