2
votes
0answers
82 views

To know in advance when one is a niddah

The gemoro and shulchan aruch has much to say about 'vestos', way to find out in advance when one will be a niddah, which rarely work today. There are modern methods which do work: does one have to ...
9
votes
1answer
392 views

Brewing fresh coffee for Shabbos with a time clock

May one prepare coffee ingredients in a brewer such as this one on Friday and set the timer to brew the coffee for 8:00 Shabbos morning?
2
votes
0answers
121 views

Am I allowed to wear my Pebble Watch on Shabbat? [duplicate]

The Pebble is a smart watch that connects to a smart-phone via Bluetooth and can deliver messages to your wrist. Am I allowed to wear it on Shabbat if I disconnect it from my phone? Think of it, then, ...
5
votes
3answers
240 views

Would time travel be assur/mutar?

Inspired by this question which the author states is not a question of issur/heter. Assuming time travel is possible (to the future or past) is there any reason it should be assur?
8
votes
1answer
144 views

Referencing Iron before the Iron Age

A guest brought up this question at the shabbos table, and no one had an answer. In D'Varim 8:9 it says "...a land whose stones are iron...". The question this guest asked was: How is it that the ...
3
votes
1answer
445 views

Self-winding wristwatches on Shabbos

Can self-winding wristwatches be used on Shabbos?