Life as we knew it is a great book about life on earth suddenly and dramatically changing told through the eyes of a teenager. A comet that is supposed to creat an amazing light show in the night sky shockingly collides with the earth's moon pushing it dangerously close to the earth. Gravity is disturbed, so tides change. Immediately Cape Cod and Manhattan are submerged. How would you respond to such a catastrophe. This book is exciting, suspenseful, scary and even a little romantic. A must read!