system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do beer cans (and pop cans) open without a sharp edge?

I've cut aluminum before and that stuff can be sharp. Yet I have never cut myself on a can. How!?
gpt
The amount of engineering that goes into the opening on coke cans and coke bottles is mind boggling. Ever single line is at a very precise angle to make it work. When you lift the tab on a can it flexes the top. If it was just simple leverage the tab would bend before the can opened, but the flexing of the top causes the score to break first.

When you cut something you pinch down on it till it shears. This pinch creates an edge. A coke top basically rips open along a scored path. There is no pinching action.