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October 1, 2024

Tackling One of the Most Complex Areas of Jewish Law with Smartphones and Data Bases

But eruv builders must still deal with blizzards and wild animals the old-fashioned way.

In 1896, the Jews of St. Louis, Missouri established an eruv, a legal fiction usually involving string, wire, and posts (and in modern times, telephone and electrical cables) that gives part of a city or neighborhood the status of a single courtyard—allowing the observant to carry items outdoors on the Sabbath. Now there are an estimated 350 eruvin in the U.S. and Canada. The laws governing the eruv are complex; they are usually established in consultation with rabbinic specialists, and require weekly checking and regular maintenance. Merri Ukraincik explains how new technology has transformed this process:

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