Series description: Phineas and Ferb know that with only one hundred and four days of summer vacation, you’ve got to make every one count! Whether they’re building a rocket or discovering an ancient mummy, they’re dedicated to making each mind-numbing rotation of the earth into something really spec...

Professional rebreather diving instructor Jill Heinerth helps divers navigate the complex, and sometimes intimidating world of rebreather diving. Providing clear, candid and straightforward information based on her decades of exploration and teaching experience, Jill leads readers through the histor...