Americans are largely optimistic about the future, according to the poll from the Pew Research Center For The People and The Press/Smithsonian Magazine.
By mid century, 71 per cent believe cancer will be cured, 66 per cent say artificial limbs will work better than real ones and 81 per cent believe computers will be able to converse like humans.
• 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.
• 63 per cent anticipate the demise of paper money...