A boom in affordable housing in the 1950s was helped by the invention of a distinctive multifunctional piece of equipment: the backhoe. Its strong yet relatively slender articulated arm allowed precise yet rapid placement for digging or lifting. The manipulative device is trim and fast, since hoses transfer power to it from a powerful hydraulic pump within the main chassis.

After 100 years, automobiles still need engine oil, transmission fluid, brake fluid, antifreeze, power-steering fluid, and so on. Wouldn't it be great if just a single multipurpose fluid could be circulated from a central reservoir? Each part would use only the needed properties of the fluid, exclude detrimental properties, and then send it back.

"And Aaron shall bear the names of the children of Israel in the breastplate of judgment upon his heart, when he goeth in unto the holy place, for a memorial before the LORD continually." (Exodus 28:29)

"These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them." (Hebrews 11:13)

Most people north of the equator have an observable suntan by August. Ironically, a desire to be outside is often coupled with another strong desire to get out of the sun, as indicated by sales of sun umbrellas and other types of sunshades.