Play Book Tag discussion

The first sentence of this book says it all. "This book is a collection of answers to hypothetical questions.
If you are a science geek, you will really like this book. The questions and answers are interesting. Each answer usually contains other hypothetical scenarios. Each answer is accompanied by stick figure drawings.
My favorite question was "How many Lego bricks would it take to build a bridge capable of carrying traffic from London to New York? Have that many Lego bricks been manufactured?"

This sounds great! (I adore his cartoon, xkcd…)