Tim Cook unveiled the long-anticipated Apple Watch yesterday.  The CEO called the device “a comprehensive health and fitness companion.”  It will also display boarding passes in airports, show a live feed of a person’s home and garage door, and run most of the iPhoneapps.  One hotel company plans to use it as a room key.  According to Cook, battery life will be 18 hours with regular use; costs range from $349 to $10,000, which includes an 18-karat gold body. MORE – VIDEO