First in the new series of In Our Time, on The Cell. Steve Jones as one of the panel of three enthusiasts talking about what they know best. Origins of life, via Schroedinger to RNA, DNA, membranes, mitochondria and chloroplasts and so forth on what cells are, how they came to be and how they work.
Early on, to illustrate the proportion of human cells to bacterial cells in a human body, Steve suggests; think of one leg filled-up to just below the knee with human cells – the rest is bacteria.
[Post note ; unconnected to this programme, but just now - two weeks later - I'm reading Stuart Kaufman's "Reinventing the Sacred" and it majors on the wonders of cell complexity - how we have become hooked on the digital information simplicity of DNA/RNA/Genes /G/A/C/T/U et al and completely overlook the other self-organizing wonders of life in both evolution and individual ontogeny.]