What If?: Serious Scientific Answers to Absurd Hypothetical Questions by Randall Munroe is an excellent quick read. Below are the three questions I enjoyed the most:
What is the longest possible sunset you can experience while driving, assuming we are obeying the speed limit and driving on paved roads?
I use one of those old phones where you type with numbers—for example, to type “Y”, you press 9 three times. Some words have consecutive letters on the same number. When they do, you have to pause between letters, making those words annoying to type. What English word has the most consecutive letters on the same key?
When – if ever – will the bandwidth of the Internet surpass that of FedEx?