Ba - 56. Barium 137.327
Zn - 30. Zinc 65.38
Ga - 31. Gallium 69.723
This postcard is postmarked in 2013.
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Bazinga: A catchy phrase to accompany your clever pranks.
As popularized by Sheldon Cooper (The Big Bang Theory).
"I just replaced your toothpaste with denture cream. Bazinga!"
Here is a video of Sheldon ...