Via Livescience:

Scientists have successfully selected and safely erased specific memories in a mouse’s brain, leaving others intact, it was announced today.

The erasure can be done while a mouse tries to retrieve an individual memory, said Joe Z. Tsien, brain scientist and co-director of the Brain & Behavior Discovery Institute at the Medical College of Georgia School of Medicine.

Fortunately, this appears to be within its early stages and hard to adapt to humans.  But believe me, people all over the world will want something like this.  Oh the things you could do…