Once your smart devices can talk to you, who else are they talking to? Kashmir Hill and Surya Mattu wanted to find out — so they outfitted Hill’s apartment with 18 different internet-connected devices and built a special router to track how often they contacted their servers and see what they were reporting back. The results were surprising — and more than a little bit creepy. Learn more about what the data from your smart devices reveals about your sleep schedule, TV binges and even your tooth-brushing habits — and how tech companies could use it to target and profile you.