Mark Bergin

Knights Needed...Could you qualify? Must be young, male, physically fit and strong. It helps to come from a noble or wealthy family so you can afford your own warhorse, weapons, and armor. Riding and fighting skills preferred.

How would you know what time it was without clocks? How would you buy things without money? It's hard to imagine what life would be like today without the inventions and discoveries that we take for granted, from the humble bar of soap to the fantastic complexity of the Internet. Combining history with science, this series explains how these products of human ingenuity have transformed our world.

"Simple machines are around us all the time and we use them every day. Many are built into complex machines, but the simple machine is still there doing its job. Discover how simple machines enable practically everything around us to work, allowing us to travel in wheeled vehicles, lift very heavy objects, put things together, and take things apart."--