New study set to test CBD on psychosis patients. How women are using Facebook to vet men on dating sites. Glacier warning after scientists film under the ice. Why people are calling Microsoft’s Bing AI chatbot 'unhinged'. In this episode:

• Never seen before footage of Titanic wreck released
• Did da Vinci discover gravity before Newton?
• Giant dinosaur footprint the ‘largest ever found in Yorkshire’
• Chinese sniffer-squirrels ‘better than drugs dogs

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