Hard to B sure. 

Particles fly from an electron-positron smash inside the Stanford Linear Accelerator Center's B-meson detector (above ). 

Analysis of 630 such "golden events" reveals a tantalizing but inconclusive difference in the properties of matter and antimatter.

CREDIT: 
BABAR COLLABORATION/STANFORD LINEAR ACCELERATOR CENTER
 

Hard to B sure. 

Particles (above) fly from an electron-positron smash inside the Stanford Linear Accelerator Center's B-meson detector. 

Analysis of 630 such "golden events" reveals a tantalizing but inconclusive difference in the properties of matter and antimatter.

CREDIT: BABAR COLLABORATION/STANFORD LINEAR ACCELERATOR CENTER