We really do not have a sense of these things. We are often overconfident in our limited senses. I was being poisoned by carbon monoxide from my oven and did no

We really do not have a sense of these things. We are often overconfident in our limited senses. I was being poisoned by carbon monoxide from my oven and did not realize it until it was too late. I told myself "it cannot happen to me". Thank God for a few related HN comments, and a hunch to buy a CO meter.