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.
Beast Boy and Terra spends a day together traveling and trying new things. They develop skills on how to build a relationship when they visit the amusement park and restaurants.