Paul Broks looks at the philosopher Ludwig Wittgenstein and the problem of "other minds". How do I know you are not a zombie who behaves like a human but actually has no consciousness? Even if you are conscious, how can I tell that what I experience as red, you do not experience as blue? I know...

If a tree falls in a forest and nobody is there to hear it, does it make a sound? That's the kind of head-scratching question that's popularly believed to occupy the time and brains of philosophers. It relates to the ideas of immaterialism proposed by Bishop George Berkeley who asserted that the...

Science is based on fact, right? Cold, unchanging, unarguable facts. Perhaps not, says physicist Tara Shears. Tara is more inclined to follow the principles of the Anglo-Austrian philosopher, Karl Popper. He believed that human knowledge progresses through 'falsification'. A theory or idea...