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How many active phone lines are there in the world? How many people die from lawn mowers on average each year in the US? How does this compare to terrorism deaths? Plus, is England densely populated compared to the rest of the world? We speak to Professor Sir David Spiegelhalter about the winners of the Royal Statistical Society’s competition to find numbers reported in the news that surprise us.

An update on what happened after ´óÏó´«Ã½ Trending’s investigation on YouTube which revealed the extent of predators on the site. What changes have YouTube made and how did the report affect advertising on the site and its parent company Google?

Why do some of us do bizarre things in our sleep such as riding a motorbike or even driving a car? These are complex behaviours and yet sleepwalkers aren’t aware of what they’re doing and often have no memory of their night-time activities. Neurologist, Dr Guy Leschziner, talks to patients he’s been treating at his sleep clinic at Guy’s and St Thomas’ hospitals in London.