It typically takes up to three generations of butterflies to make the complete journey. This means that the navigation information is genetically programmed.
Our relationship to this most familiar star is something that, as light-dependent aerobes, we often blithely take for granted.
It is a matter of fact — a straightforward scientific fact known since the basics of human reproduction were first understood — that human life begins at fertilization of the egg by the sperm.
Consider an analogy. Imagine you have gone to visit the circular pattern of great stones on the Salisbury Plain in England known as Stonehenge.