Book excerpt: A revealing and entertaining look at the world, as viewed through mathematical eyeglasses. From the moment our feet touch the floor in the morning until our head hits the pillow, numbers are everywhere. And yet most of us go through each day unaware of the mathematics that shapes our lives. In fact, many people go through life fearing and avoiding mathematics, making choices that keep it at arm’s length or further. Even basic math — like arithmetic — can seem baffling. In Our Days Are Numbered, Jason Brown leads the reader through a typical day, on a fascinating journey. He shows us the world through a mathematician's eyes and reveals the huge role that mathematics plays in our lives. It lies hidden within the electronics we use, the banking we do, and even the leisure activities we enjoy. Whether we’re putting a down payment on a new car, reading the financial pages, or listening to our favourite songs, math is behind it all. At once entertaining and informative, Our Days Are Numbered covers an array of mathematic concepts and explores the hidden links between mathematics and everyday life. Brown reveals that a basic understanding of math can make us more creative in the way we approach the world.