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More Or Less reports on British snooker player Ronnie O’ Sullivan’s decision not to complete a maximum 147 this week because he said the prize money at £10,000 was too low. Can incentives demotivate as well as motivate people?

And how do you measure a coastline? It’s trickier than you might think.

Â鶹Éç Trending looks at Facebook’s attitude to pages that advertise and promote recreational marijuana and hear from one company whose page was taken down. The sale of marijuana is legal in four states in America while still illegal under federal law.

Also, women in Trinidad and Tobago shared their experiences of sexual assault and called on the mayor to resign after he blamed a victim’s ‘vulgar’ behaviour for her death.

And, in the Why Factor Mike Williams asks why some people succumb to addiction. He asks scientists what happens when the biochemistry of the brain’s pleasure and reward system goes wrong and hears from former addicts about the power of addiction.

(Photo: Ronnie O'Sullivan. Credit: Adrian Dennis/AFP/Getty)