To see cells in action, he notes a remarkable video, “Neutrophil Chasing Bacteria,” made in 1950s by a researcher at Vanderbilt University.
Self-evidently, the gravity on the surface of a planet limits the maximum size of large terrestrial organisms.
As we have seen so far in this series, fire was an absolutely crucial component in humanity’s rise to civilization and technology.
As symbols of the perfection of human form, one might consider the Venus de Milo or Michelangelo’s David. But those don’t show the insides.
The firm belief in extraterrestrial life — a belief nearly universal in the scientific community — is an act of faith.