We are doing some essential maintenance work and you will not be able to register or update your profile setting until we've finished, which should be at about 9pm this evening.
We apologise for any inconvenience - you will be able to register shortly. In the mean time you will still be able to log in as usual.
Chris Rock鈥檚 joke about US gun control exemplifies a cognitive sophistication that machines will struggle to match, say Akhil Bhardwaj and Anastasia Sergeeva
