system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why the Japanese confuse "l" and "r."

It's been a joke for a long time, but all the articles I found were hardcore linguistics.
gpt
A human vocal system can make a huge variety of sounds. Each language only uses certain number of those sounds. Once a person is past a certain age, it is hard for them to learn sounds that aren't a part of the language that they grew up speaking. 

Japanese doesn't have separate sounds for the letters L and R. The sound for R is the closest one they have to the sound for L. When they try to say an English word with an L sounds, they closest one they can think of is R.