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What is meant by the square root of minus 1...

The 'circle number' pi has fascinated people for thousands of...

What is the Mandelbrot set? How can prime numbers protect...

The age in which Dickens lived saw enormous changes in...

What is a number? Can you solve a quintic equation...

What shape is the Earth? How do strings vibrate? Can...

The series ended with a lecture bringing us up-to-date with...

What was the Enlightenment, and how did the church respond...

For a period of over 200 years, starting in the...

Why did the Western church divide in the sixteenth century...