P Ghose 
Riddles in Your Teacup [PDF ebook] 

Natural phenomena and ordinary, everyday things often contain surprises and puzzles when we attempt to understand them in terms of basic physical principles. Trying to explain what we see around us can even help us to understand physical principles more fully.
Written by two well-known popularizers of science, Riddles in Your Teacup, Second Edition focuses on many puzzles, both simple and advanced, that relate to these phenomena. Revised and enlarged, this fascinating second edition contains challenging questions about everyday scientific mysteries. It presents an amusing and entertaining collection of puzzles and solutions, including some riddles that have continued to defy explanation.