When we look at the world, then our eyes send around 60 images or flash up to the brain every second. Our mind then adds these images, helps us see this way.
The eyes of a fly send 250 shades per second in its brain, which means it takes 4 times more visual information. Therefore, when its brain connects 250 images, it takes one second too long, causing the fly to appear in slow motion and allows it to react very quickly to us.
Now, when we move our hand to kill the fly, then our action seems like a super-quick single action for us. However, due to the ability of the fly to see our action in slow motion, it gives enough time to fly, while we are in the middle of action.
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