How many people attended President Trump’s inauguration? How many people went to the Women’s March in Washington DC the next day? A fierce debate has been raging about the numbers of people at each event. We explore the difficulties of counting people in a crowd.

Tens of thousands of automated videos have appeared online recently. All feature photos of news events accompanied by a robotic voice. BBC Trending’s very own digital supersleuth Mike Wendling investigates who’s making them and why.

Can deep-frozen bodies ever return from the dead? Mike Williams explores the science, the motivation and the ethics behind cryonics and asks whether frozen human bodies will ever be fit for a new life.

(image: Attendees line the Mall at Trump's Inauguration Day in Washington DC. Photo: Lucas Jackson/Getty Images)