How can you tell if someone is Chinese or Japanese?

It's impossible to tell someone's nationality or ethnicity based solely on their appearance.

Here's why:

* Physical Appearance: There is significant variation within both Chinese and Japanese populations. People from both countries can share similar physical features, such as eye shape, skin tone, and hair color.

* Culture and Language: While there are some cultural differences, it's not accurate to assume someone's nationality based on these. Many people from both cultures may share similar interests and values, and language is not a reliable indicator either.

* Stereotypes: Making assumptions about someone's nationality based on their appearance perpetuates harmful stereotypes and can lead to discrimination.

Instead of trying to guess someone's nationality, focus on respectful and genuine communication. Get to know them as an individual and learn about their background if they are willing to share.