One of the earliest lessons in science that students learn is that a ray or beam of light travels in a straight line.
Word of the Day
Any of various tropical Old World birds of the family Indicatoridae, some species of which lead people or animals to the nests of wild honeybees. The birds eat the wax and larvae that remain after the nest has been destroyed for its honey.
Honeyguide birds have even been known to eat candles.