Crowdfunding, Farming Tech, and Doom

Mark Harris, who investigated what went wrong with the failed Kickstarter drone project Zano, gives us his conclusion. We hear Microsoft's plans for the 3D virtual world Minecraft. We find out how farmers are using autonomous vehicles and big data to get the most from their land. And we talk to John Romero, the creator of the seminal videogame Doom, on why he's released a new final level, 23 years after the game first came out.

Presented by Rory Cellan-Jones, with special guest Rob Carter of Fieldmargin, and BBC Online reporters Chris Baraniuk, Zoe Kleinman, and Jane Wakefield. (Picture: Farmer in field using smartphone, Credit: iStock).