<http://schema.org/image>
<http://rack.1.mshcdn.com/media/ZgkyMDEzLzA3LzEyLzJiL0hlYXJ0YmVhdGlTLmJlNmI3LmpwZwpwCXRodW1iCTEyMDB4NjI3IwplCWpwZw/755c5765/28c/Heartbeat-iStock.jpg>
<http://mashable.com/2013/07/12/optical-stethoscope-concept/>