Einstein's Riddle: Riddles, Paradoxes, And Conundrums To Stretch Your Mind
Riddles, Paradoxes, and Conundrums to Stretch Your Mind »

Einstein's Riddle
A unique compilation of logical teasers and lateral-thinking problems »

Philosophy
Philosophy »

Would You Eat Your Cat?: Key Ethical Conundrums and What They Tell You about Yourself
Key Ethical Conundrums and What They Tell You about Yourself »

Why Truth Matters
Why Truth Matters »

Philosophy
Philosophy »

Does God Hate Women?
Does God Hate Women? »

The Story of Philosophy
a History of Western Thought »

The Great Philosophers
From Socrates to Foucault »

What Scientists Think
What are leading scientists working on now? What do they think about theworking of the brain climate change animal experimentation cancer andmental illness? ... »