system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why does using a fly swatter make me so much more effective at killing flies?
gpt
Flies can detect very small changes in pressure around them and your hand coming at them is a very obvious change in the air around them. 

A fly swatter is designed so it does not disturb the air as much (all the tiny holes) and makes it harder for them to detect that something is coming at them.