Absorb is a series of interactive online courses for secondary schools, covering physics, chemistry, electronics, mathematics and advanced physics. Our unique simulations, interactive animations, and videos, are linked by an involving narrative, providing the basis for an interactive learning experience. Each title offers a huge amount of interactivity - ranging from simple animations that show hidden concepts, to powerful models that allow flexible experimentation. Each title is well-suited to self-study or review, or provides a framework to teach in front of the whole class on a whiteboard.