All Questions
2 questions
6
votes
1
answer
2k
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Electronic card readers to enter buildings on Shabbat?
As a student, I've noticed that practically all of the dormitories in my university require residents to tap their student cards to a sensor before they are allowed to enter their building. (Moreover, ...
user8555
5
votes
1
answer
750
views
Attending a lecture, with slide projection, on Shabbat
On Shabbat, may I go to a public lecture and look at the screen? Slides from a computer are projected onto a projection screen. The lecturer may be using a microphone. The lecture will take place ...
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