The “selectivity filters” in membrane channels of living cells are able to discriminate between very similar molecules or atoms using complex mechanisms.
The nucleus is a beehive of activity, where information is not just stored but processed, protected, transcribed, and duplicated by highly complex machines.
René Descartes conceived of living things as complex machines, a concept now known as the “machine metaphor.”
Protein folds show more flexibility than previously thought, but the flexibility appears designed. If it’s hard to get one fold to work, how about two in the same protein?
A simple tissue we take for granted turns out to represent another example of irreducible complexity in the human body.