Beakman explains how light rays reflect off of smooth vs. bumpy surfaces. Since a mirror is smooth and is coated with a metallic backing, the light comes right back at the perfect angle, creating a reflection.
A boy and his tribe, the Pawnee nation, gets involved in a fight with another tribe. They were successful at the cost of the boy's horse getting shot. Fortunately, the boy finds another horse and celebrates with his tribe as he finds more.
It is described how many tribes were drawn to live near the Nile River, and how these were united to form Egypt under Menes. The narrator then describes how canals were built, and how they became ancient Egypt's main system of transport. It is then detailed how ancient Egyptians took advantage of canals and what particular commodities were transported through the canals.