What’s the best way to measure a hurricane? As hurricanes continue to threaten the Caribbean and American East coast, Tim Harford examines the different ways of calculating their respective strengths.

We investigate new German legislation which will force social networks to delete hate speech – or face massive fines. Some support it, and the government is determined to go ahead, but critics say it will restrict free speech.

Red roses, romantic dinners and Valentine's Day might have become the modern expression of romance – but where do its ancient roots lie? And do traditional ideas about romance conflict with today's experience of gender, love and sexuality. Afua Hirsch reports.

(Satellite image showing Hurricane Irma moving towards the Florida Coast on Sept 07 2017. Photo credit NOAA GOES Project via Getty Images)