... A Brief History of Space and Time by Steven Hawking. Some of it is a little hard to grasp especially with only a GCSE level physics - but its super interesting. Its set me off thinking about things in 4 dimensions, and space and time as a curved sheet, gravity bending light, and the mass of planets 'bending' what we think of as space, and also bening time. Its very dense, textually, but if you spend your time its very interesting. Ive spent about 4 hours reading the first 40 sides. If you have any interest in meta-physics, quantum-physics or time and the universe and how our perception of them is affected, then give this book a read.