Despite the constant threat of exploding Palestinian rockets, a teacher in the Israeli city of Kiryat Malachi continues to lead lessons for her students, young Chabad-Lubavitch emissaries who are stationed with their parents all over the globe.

Rivki Lipsker teaches in an Internet-based virtual classroom run under the auspices of the Shluchim Office in Brooklyn, N.Y., and had to run to her bomb shelter on Wednesday when the air raid siren sounded in the middle of class.

She’s since moved her computer to the shelter. …