In this illustration, two different B mesons are changing between states (represented as colors); however blue-B changes into red-B more quickly than red-B changes into blue-B (a process running in ... more 
In this illustration, two different B mesons are changing between states (represented as colors); however blue-B changes into red-B more quickly than red-B changes into blue-B (a process running in reverse-time, as shown by the backwards clock less 
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LiveScience.com | Photo By Greg Stewart, SLAC National Accelerator Laboratory
Mon, Nov 26, 2012 12:10 PM EST