Peter Singer has argued that animals, like humans, deserve protection because of their ability to suffer.
It turned out last week that scientists have been wrong for 350 years about how sperm swim.
It takes foresight to make complex tools and procedures that can restore the functions of other tools. A blind process can only see the immediate present.
Changes in the world of medicine strongly show that a master architect has been at work.
The firm belief in extraterrestrial life — a belief nearly universal in the scientific community — is an act of faith.