Do you remember the "evil maid" attacks? Evil maid attacks are a catch-all term for security vulnerabilities in OS X devices that required a hacker to insert a USB drive into a computer.
If a maid were evil, then she'd be able to easily pull off these attacks. The vulnerabilities were disclosed because of Google's Project Zero initiative.
Project Zero, if you remember, has been harrying Microsoft by disclosing major security vulnerabilities in the Windows operating system. Though every company with a security flaw revealed by Project Zero has accused Google of bullying, no one can deny that it gets results.
Apple just fixed the "evil maid" vulnerability in a new update to OS X Yosemite.