@scroll.engineer: AirDrop can send an entire video between two iPhones without internet, cell service, or even a Wi-Fi router. So how do two phones find each other, establish a secure connection, and transfer millions of bytes in seconds? The cleverest part isn’t actually the file transfer. It’s what happens before you even hit Accept. And once you understand how it works, you’ll never look at that little AirDrop notification the same way again.