How Tech Works

The engineering behind flying robots that build enormous, organized structures without any help from humans.

We meet an online blogger who is obsessed with hot wheels: he writes about race cars and fast lap times from an old race track in Germany ; Spain's new military planes may be as versatile as a cargo van, but they're made for more heavy duty work: part transport plane, part flying hospital; Watch as a team of road warriors build home-made 'derby' cars.

An old parking lot is converted into a modular, Olympic-ready whitewater rapid course; We head to Barcelona, where they are building an underground high-speed train line under some of the city's most famous buildings - without disrupting any of the famous architecture; A 2-wheeled car is totally enclosed and totally electric. Best of all, it never tips over.

We sign off this week with a high speed bike that leaves the competition in its tracks - thanks to a little help from a jet-pack engine; A 3-D camera unlocks some of the mysteries of the legendary Stonehenge - and reveals intriguing graffiti too; A truly unique research centre that explores ways to minimize firestorm damage during natural disasters.

We all know wine tastes better as it ages - but what would you say to a beer 65 million years in the making?; We find out how one inventor is taking the work out of rollerblading. After getting tired of pushing his daughter on roller skates - he just added an engine; 2 bickering brothers roast their beans with some help from Mother Nature, and a thousand tiny mirrors.

Painting an Airbus 330; headwear for military pilots; building an electric unicycle.