Now in its second edition, this ever-engaging, humorous and extremely popular book challenges readers to think philosophically about every day dilemmas. This fully updated new edition includes brand new problems, such as 'A Nasty Transplant' and the 'Three Embryos', from the field of medical ethics, and 'Deep Thought Speaks', which tackles issues in Artificial Intelligence. These new conundrums accompany old favourites, such as the 'Hanging Judge', 'The Unexpected exam', 'The Sentence' paradox and 'Descartes' big problem', all explained and explored in Martin Cohen's clear, witty and individual style. 101 Philosophy Problemswill stimulate hours of lively philosophical debate.