Humans’ digestive tracts are smaller in relation to our total body mass than any other mammal, which is probably related to why we do poorly with raw food diets while most other mammals do well.
Cheese was likely discovered by someone Back in the Day (5000 years ago?) using a stomach as a carrying sack for milk, thus getting rennet into it by accident.
There’s evidence that “fossil fuels” may be created by processes involving non-organic components as well as those involving organic ones. No one really knows how widespread this is.
A scientist speculates that organisms likely exist underground that we don’t recognize as alive because most of our assays for life involve testing for the presence of cells or DNA. If we are able to broaden our detection criteria, we might discover new mechanisms for life that are totally new to us and could help us to understand how life as we knew it came to exist in the first place.