What do Facebook exec Sheryl Sandberg and singer Matisyahu have in common?

Sheryl Sandberg

Chances are you know Sheryl Sandberg as chief operating officer of Facebook and author of the much-talked-about best-seller "Lean In: Woman, Work, and the Will to Lead." But did you know she attended Alexander Muss High School in Israel? 

And she's far from the only big-name alum of the JNF-supported international study-abroad program for high schoolers.