Reasoning together to solve problems should never be considered impossible in America.

CNN: Three areas where Biden and NRA can find common ground

For many years, the 4 minute mile was considered to be an impossible feat.

FORBES: The Four Minute Malware: Aurora, Stuxnet, and Beyond

Ms Deech said that while international agreements to stamp out the worst ethical excesses would be desirable, implementing them would be "impossible", not least because different countries did have discernable differences in what is considered acceptable.

BBC: Halting the fertility 'fraudsters'