# SPOOL RIDDLE - Which way will it roll? | Summary and Q&A

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May 25, 2017
by
Physics Girl
SPOOL RIDDLE - Which way will it roll?

## TL;DR

Anne Wojcicki and Diana Cowern discuss riddles, including a riddle about walking on a globe and a riddle involving a spool's movement.

## Key Insights

• 😥 The first riddle has two possible answers depending on the starting point on the globe.
• 🥇 The first riddle can have an infinite number of places where going east in a full circle leads back to the same spot.
• 🤣 The second riddle involves a fixed spool and the question of its rolling direction when pulled sideways.
• 🎮 The video provides a recap of the first riddle and its explanations.
• 🍃 Anne Wojcicki and Diana Cowern discuss the second riddle and leave the answer for the next video.
• 💬 Viewers are encouraged to discuss and suggest future riddle participants in the comments.
• 🎮 The video is part two of a series on riddles with Anne Wojcicki.

## Transcript

Hi, I'm Diana. You're watching Physics Girl. Welcome to part two of Riddles with Anne Wojcicki. If you missed the first part, there's a link in the description, or you can jump to the end of this video. At the end credits, there's a direct link. Here's a recap of the first riddle, and it's gonna go straight into the answer. So you've been warned. ... Read More

### Q: Where is the adventurer in the first riddle?

The adventurer is at the North Pole. Starting from there, walking south, east, and north leads back to the same spot.

The additional answer is starting north of a place where going east in a full circle and ending up in the same spot. This allows for an infinite number of places toward the South Pole.

### Q: What is the second riddle about?

The second riddle involves a spool that is fixed and is pulled sideways. The question is which way the spool will roll.

### Q: What are the possible outcomes in the second riddle?

The possible outcomes are for the spool to roll to the left and wind up, roll to the right and unwind, or not move at all.

## Summary & Key Takeaways

• Anne Wojcicki solves the riddle of an explorer starting at the North Pole, walking south, east, and north, and ending up in the same place.

• Diana Cowern explains that there is an additional answer where an explorer can start north of a place where going east in a full circle and ending up in the same spot.

• The next riddle involves a spool that is fixed, and the question is which way it will roll when pulled sideways.