1] babies don't have knee caps. they develop between 6mths and 2 yrs. 2] the invention of toilet paper didn't take off until they made it into seperate squares. people prefered to use sticks & leaves 3] the enginering principles we use to build buildings are exactly the same as in an ant hill. 4] antibiotics were developed when a scientist wondered why ants keep touching each other in transit [they pass antibodies around the colony] 5] i cant think of any others just now. you got any?