“Taming” chance, that is, describing it with the help of numbers and predicting the future, is a real feat, the fruits of which we have been enjoying for quite a long time. For example, today we can determine with sufficient accuracy who will win the elections even before they take place, or estimate how long an energy-saving light bulb will work.  And yet, the complete conquest of chance is still very far away. Randomness is one of the last white spots on our mathematical maps, which causes a lot of anxiety in a society that craves reliability and certainty.  After all, we live not in an ideal world, but in a real ocean of uncertainty.  This book is a kind of call to study randomness and reflect on it.  On this path, readers will find many challenges, discoveries and surprises.