A Boston hotel called Nine Zero is using biometric iris scanning to replace room keys, allowing guests to gain access to their rooms with just a quick flash of the eyeball. Using a system from LG, first-time guests have a picture of their iris scanned, which is quickly encrypted to a hashed numeric code and the source image deleted (meaning they don’t keep a copy of your iris on file, just the results a scan of your iris would provide). Because the data can be held on to indefinitely, returning guests can make reservations and gain access to their rooms without ever talking to a clerk, booking a room by email and getting their room number in response.