And the U.S. government makes policy on this assumption

More than 4 in 10 Americans are idiots, according to a poll from the Pew Research Center For The People and The Press/Smithsonian Magazine (see last bullet):

• 71 per cent believe cancer will be cured by 2050.

• 81 per cent believe computers will be able to converse like humans.

• 68 per cent of those under 30 predict a world war by 2050.

• 53 per cent say ordinary people will travel in space

• Nearly three-quarters, or 74 per cent, of those polled believe it likely that "most of our energy will come from sources other than coal, oil, and gas".

• Yet 72 per cent believe the world is likely to experience a major worldwide energy crisis by 2050.

• 66 per cent say the Earth will definitely or probably get warmer but it breaks down strongly along political lines, with just 48 per cent of Republicans saying so and 83 per cent of Democrats.

• 42 per cent say it is likely that scientists will be able to tell what people are thinking by scanning their brains but 55 say this will definitely or probably not happen.

• 89 per cent believe a woman will be elected US president by 2050.

• 86 per cent say it is at least probable that most Americans will have to work into their 70s before retiring.

• 41 per cent say Jesus Christ will return within the next 40 years while 46 per cent say this will definitely or probably not happen.