-there are seven wonders of the ancient world
-there are seven continents in the world
-there are seven colores of the rainbow
-there are seven days in a week
-there are seven basic musical notes, ie: do, re, me, fa, so, la, ti
-a ladybug commonly has seven spots
-most of the mammals' necks have seven bones
-the number of rows in the periodic table is seven
-the neutral pH value that lies between acidity and alkalinity is seven
-digital devices use a seven-segment display
-there are seven logic gates namely: NOT, NOR, XNOR, XOR, AND, NAND and OR
Adapted from: Nature and health, the borneo post 2008
