The cloud isn’t some nebulous construct that floats above us in the sky and magically stores and disseminates information. It’s actually a mind-boggling number of hard drives collected in datacenters located all over the world, connected by miles and miles of cable, so we can store enormous amounts of information and communicate almost instantaneously across the globe. You and everyone who uses the Internet to send an email, update a social media site, or host a sound file uses these datacenters. How much do you know about them?