If you asked a sample of Americans "What is the temperature of Mars?" about 8% would say they don't know.
If a thing can't go on forever, it will eventually stop.
If something is inevitable, it will happen
[The Democrats] will say that the Reagan administrtion has given benefits to the rich at the expense of the poor - a term that they define broadly to include middle-income people, women, minorities, the aged, the young, farmers, steelworkers, and others.
Trends that can't continue, won't.
Things that can't go on forever... don't.