Kosher appliances observe the sabbath
I found this an interesting engineering application to meet religous needs. Also, it can get us to think about our own adherance to rules and the basis for those rules.
The source of the paragraph below also includes user comments. Some of them are interesting as well.
How do modern Jews survive after sun-down on Friday given they can't use electricity? They buy Star-K-approved devices. These devices include a "sabbath mode" in which they won't turn on as a direct result of human intervention. Flip a switch, the light doesn’t turn on. However, it may turn on randomly 10 second later, not as a direct result of the switch flipping. Open the fridge, the light doesn't come on and the compressor doesn't immediately compensate. So if you're looking for a kosher oven, look for the Star-K.
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