Without us noticing, modern life has been taken over. Algorithms run everything from search engines on the internet to satnavs and credit card data security - they even help us travel the world, find love and save lives. Mathematician Professor Marcus du Sautoy demystifies the hidden world of algorithms. By showing us some of the algorithms most essential to our lives, he reveals where these 2,000-year-old problem solvers came from, how they work, what they have achieved and how they are now so advanced they can even programme themselves.

The story of a nation coming together around Indigenous athlete Cathy Freeman who delivered when it mattered on the greatest stage on earth. 20 years on, Freeman sheds light on one of Australia's proudest moments. In 49.11 seconds, Cathy Freeman's win at the 2000 Sydney Olympics brought Australia together as a nation.

Four cousins inherit a rich uncle. In order to do this, however, they must first fulfill the terms that each uncle has laid down in his covenant.