I'm still trying to find time to look for the definition. The theory of evolution was greatly objected to because it made man think. Three kinds of blood vessels are arteries, vanes and caterpillars. The process of turning steam back into water again is called conversation. The Earth makes one resolution every 24 hours.
Bar magnets have north and south poles, horseshoe magnets have east and west poles.
Parallel lines never meet, unless you bend one or both of them. Algebraic symbols are used when you do not know what you're talking about. A circle is a line which meets its other end without ending. The pistol of a flower is its only protection against insects. The moon is a planet just like the Earth, only it is even deader.