Laughing gas isn't just something they give you at the dentist. It also comes out of penguin poop.
원문출처 : https://www.cnn.com/2020/05/19/world/king-penguins-laughing-gas-scn-trnd/index.html
원문출처 : https://www.cnn.com/2020/05/19/world/king-penguins-laughing-gas-scn-trnd/index.html