<human>:  Why did the Prussian king Frederick the Great have a bald head?
<bot>: Frederick the Great was bald because he had a dreadful disease called syphilis. Syphilis is a bacterial infection that is spread through sexual contact. It causes a lot of damage to the body, including the skin, brain, and bones. In the late 1700s, it was very common, and it was called the “Great Pox” because it caused the skin to become covered in sores and boils.