Apple's Gamble On Fingerprint Scanners May Take A While To Pay Off

Marissa Mayer doesn't use a passcode on her iPhone. As the CEO of Yahoo, one of one of the world's largest technology companies, she probably has some pretty important information sitting on her device. And although she has to deal with the constant threat of being hacked at any time, it's just too inconvenient for her to enter a few digits each time she wants to send an e-mail.