What is a mentifact?

How long is the earths crust? How is the country of Mexico divided? How are chromosomes and mutations related to genes and inheritance? Why are washers used in bolted joints? What properties of plastic makes it suitable to be used in electrical work? What do each of these areas of mineral deposits have in common? What is difficult to determine in the process of adaptation unless there is a closely related species to which you can compare findings? How long is 5mw in feet? Is Masonite flame-retardant? How many nitrogen atoms are indicated by the formula AI No 3? How many 250 ml glasses to fill 4.5 liter bowl? Why is the compass headed to the north pole? What is the global impact on society of the bike and subsequent innovations? The smallest group into which an organism is classified? What is the name for the boundary around a black hole beyond which events cannot affect the observer? How long is a day on Vesta? Was London built on seven hills? How many gallons in 6HL? Where does most of the photosynthetic activity of a leaf take place? What is the scientific name for an yam plants?