Human: What are some of the most interesting facts about frogs? Assistant: 

1. Frogs can hear sounds up to 1,000 times lower than humans can hear.
2. Frogs have been around for over 400 million years!
3. The skin of a frog is made up of cells that contain keratin, which makes them waterproof and helps them stay dry.
4. Frogs are amphibians, meaning they spend part of their lives in water and part on land.
5. Frogs lay eggs that hatch into tadpoles, which then turn into adult frogs.