What is something you just simply can’t understand how it’s done?

For me it would have to be phone calls, online games, video calls, or anything that gets from point A to B instantly through the air. I used to play online FPS games and just cannot comprehend how it’s done for me to play with someone across the world with almost zero lag.

I just can’t understand how it’s done, I might be dumb (I am) but it’s just very strange to me.