About burgers and black holes

Today I learned that my burger delivery only arrives because massive black holes out there are pumping radio signals into the vastness of the universe.The first time I consciously encountered GPS, I thought my device somehow connected to a satellite, which then shared its position with my device. I quickly learned that it doesn't work that way and is a little more complicated. After a long day at work, you finally arrive home and decide to just order a burger, turn on Netflix, and let the day be. Then you sit on the sofa and make that one move. You know THAT move. Every two minutes, you pick up your phone and check the status of your order. When the burger is finally ready, a probably poorly paid delivery driver puts it in his bag, hops on his bike, and rides over. That's the moment you can track your burger live on the app. The driver most likely got your address directly through the app. Twenty years ago, he would have needed to know the city pretty well to know the fastest way to…