It's a mental challenge, as much as anything else.

BBC: Brian Davis at Olympia Fields in 2003

In his first political campaign for a seat as a circuit county judge, McCarthy published campaign literature falsely claiming that his opponent was 73, senile and guilty of financial corruption despite knowing that the gentleman was 66, in full control of his mental faculties and had never done anything that had so much as a whiff of corruption.

FORBES: Ted Cruz-The Reincarnation Of Joe McCarthy?

The intensity of Mr Searle's criticism gives the impression that these philosophers' mistakes are even worse than Mr Penrose's even though Mr Penrose's extravagant hypothesis that there are three worlds (the physical, the mental and the mathematical) will seem quite as strange to most readers as anything from Mr Dennett or Mr Chalmers.

ECONOMIST: Philosophy of consciousness