system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do shoelaces untie themselves while headphones get themselves into knots?
gpt
Headphones are often covered in rubber, which is a sticky material, whereas shoe laces are often made of fabric, which is a soft and somewhat slippery material. 
If we had shoelaces made of rubber, they would stay longer together and vise versa with headphones.