When Prince Rodolfo's monsters attack her, Petra Kronos is spirited away to London. As she struggles to escape, Neel and Tomik sail the high seas, in search of

Marie Rutkoski's startling debut novel, the first book in the Kronos Chronicles, about the risks we take to protect those we love, brims with magic, political i

The Ever-Changing Sky provides a comprehensive and non-mathematical guide to spherical astronomy. The reader is guided through terrestrial and celestial co-ordi

The concept of the earth as a sphere has been around for centuries, emerging around the time of Pythagoras in the sixth century BC, and eventually becoming domi