How Did You Know? - {day 5}

David K. Israel

If you've made it this far, I commend you! One more puzzle to solve and you're home free. First one to send in the correct answer to the challenge below, along with the correct answers found all along the path this week, AND, the logic behind "˜em (which is to say: HOW DID YOU KNOW?), gets a pick of any two t-shirts and book from our store. As always, we'll also be awarding one t-shirt to a random winner who has all the answers correct, as well. So if you're an hour late, a day late even, there's still a chance to win a prize. We usually pick the randoms about four days after the final puzzle goes up.

Katie Richie and Stacy Vallely are our current champions. You can read about them here.

As comments have been turned off for the length of the hunt, please click on the following link and send your answers and logic to us at:

If you missed Day 1, Day 2, Day 3 or Day 4's challenges, there might still be time to solve them all. No one knows how long it'll take for one of you trivia junkies to nail down the whole megillah, so make haste, make haste. And now, on the next page, I present the final puzzle, drawing on all the answers you dug up along the trail.

(see you on Feb 24th for the next HDYK puzzle)

Day 4: On Friday you were asked to name five different famous equations. One of these has something to do with a certain law of thermodynamics. Another law of thermodynamics states: As a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value. Question: Absolute zero of what? Day 1: On Tuesday you were asked to name seven atoms. Only one of the atoms has something in common with your cell phone's ringtone. What's the connection? The atom in question is made up of how many electrons? How many protons? How many neutrons? Compared one to the other, each number is exactly ________ what? This is your answer for Day 1. Day 2: On Wednesday you were asked to name seven athletes. One of the sports represented is played on a surface of water cooled below 0º on what temperature scale? Day 3: Part of your challenge on Thursday was to uncover the names of seven U.S. locations home to major astronomical observatories. Only one location both begins and ends with the same letter. That letter stands for a certain temperature scale named after a German physicist. What is his last name? Day 5: You should now have enough information to complete the puzzle. (hint: we're talking about the comparison of two scales, which only yields one correct number.)