system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do things like hand sanitizer only kill 99% of bacteria? How does that other 1% survive?
gpt
It's more of a liability protection than an actual scientific statement of fact. If you get sick from a virus or bacteria after using their product, and you try to sue them, the company can always defend themselves by saying "We didn't say it's perfect. It's only 99% effective."