Funny the article didn't offer any explanation about the death of the firstborn, or any of the other plagues that only afflicted the Egyptians, despite the Israelites living within their midst.
There are advantages to a Kosher (Clean in Hebrew) lifestyle...
or maybe not.
Check out the DVD, “Exodus Decoded”, which I borrowed from my local library. These kinds of naturally occurring poison gas eruptions do happen, even today, and they are very selective. People on higher ground aren’t harmed. One boy in an African village experienced it; everybody living downwind died in their sleep, people and animals alike. The Egyptians allowed the first born son to sleep in a low bed, but the rest of the family would sleep on the roof and were therefore spared. Why it didn’t happen to Jewish families I can’t explain, except that it can be very local as I said.