From the author of Einstein's Riddle comes a collection of ingenious puzzles that will stimulate your brain while also introducing you to science's most intriguing concepts, paradoxes, and unsolved conundrums. How can a cat be both dead and alive? Can you travel back in time to kill your own grandfather? How can a particle also be a wave? And where are the aliens? After guiding readers through warm-up logic puzzles designed to sharpen the wits, Jeremy Stangroom tackles time dilation, wave-particle duality, time travel, and quantum entanglement, along with many other scientific phenomena. Engaging your critical thinking skills while at the same time challenging your sense of reality, Einstein's Twin is a must-have for any avid puzzler's library. “An amusing collection of scientific conundrums to entertain and instruct the curious.” ― Publishers Weekly Jeremy Stangroom is co-editor, with Julian Baggini, of The Philosophers' Magazine and co-author of Do You Think What You Think You Think? (Granta, 2006), What Philosophers Think and Great Thinkers A-Z. He and Ophelia Benson are co-authors of Why Truth Matters and The Dictionary of Fashionable Nonsense (Souvenir, 2004).