Take a quick break!




Two molecules are walking down the street; one bumps into the other and says:
"Oh, my fault. Are you okay?”
The second molecule says: "No, I'm not okay. I've lost an electron!"
The first molecule says: "Are you sure"
The second molecule answers: "I'm positive!"
Now get back to work! Click on any topic above to start reading useful pearls for the USMLE.

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