How Do They Do It? Season 9 Episode release dates & where to watch

1. Chewing Gum, Fish Hooks, Legoland

How do they transform rubber into chewing gum; how do they make fish hooks strong enough to catch a shark; and how are the models built at the world's largest...

2. Leatherman, Formula 1, Glassware

How do they build Formula 1 racing cars; how do they make the Leatherman, America's best-selling multi-tool; and how do they create classic Finnish Aalto glassware?

3. Hats, Longest Road Tunnel, Snake Catcher

Panama hats; rounding up Florida's escaped pythons; keeping drivers safe in the world's longest tunnel.

4. World In Miniature, Rhubarb

How do they build working miniature airports? How do they design houses to survive hurricanes? How is rhubarb cultivated in the dark?

5. Almonds, Snowblower

How do billions of bees produce tonnes of California almonds? How do they clear the snow to keep Norway's planes in action? How are tricky stains removed?

6. Fighter Plane, Trappist Beers, SUV

How is a modern fighter jet built? How do Belgium's Trappist monks make the world's finest beers? How do they build America's best performing SUV?

7. Guacamole, Swamp Buggy

How do volcanoes help produce the world's best guacamole? How do they build trucks that can cross swamps? How do they make the world-famous Fiskars scissors?

8. Suspension Bridge, Crossbows

How do they make steel cables strong enough to hold up a 50,000 tonne bridge; why do modern hunters use medieval weapons; and how do shops know which clothes sizes...

9. Tennessee Whiskey, Nightvision

How do they make Tennessee whiskey the traditional Lincoln County way? How do night goggles work? How do the Finnish relax in 160-degree saunas?

10. Vanilla, Anchors

How do they grow enough vanilla to make the world's favourite ice cream flavour? How are anchors for huge ships built? How are 12 million lighters made every year?

11. Leather Footballs, Mussels

How do they craft footballs for the National Football League? How do they farm mussels? How do they design the ultimate fighter pilot's helmet?

12. Scania Trucks, Miracle Forensics

How are powerful Scania trucks built? How do they use the world's biggest DNA database to solve crime? How is paraffin used to make Gouda cheese?

13. Guitars, Rope Access

How do they make the finest classical guitars? How do they keep the blades turning on a wind turbine? How do they produce America's ultimate mowing machines?

14. Liferafts, Mind Control

How can lifeboats hold up to 150 people? How can mind control techniques help golfers improve their shots? How do they make millions of celebratory stamps?

15. Tequila, Steam-Powered Megacity

How do they produce tequila from cactus plants in Mexico? How does New York City run on steam? How do they produce soft ice cream?

16. Stuntmen, Seabreacher, Amber

How stuntmen survive a day of being knocked down and beaten up; how they make a watercraft that can swim like a dolphin; how they mine precious amber.

17. Tennis Balls, Surround Sound

How is NYC supplied with the finest steaks? How do they produce the ultimate surround sound home cinema systems?

18. Rayon, Snuff, Cola

How is viscose transformed into clothing and cloth? How do they produce the world's favourite fizzy drinks? How do they make traditional English snuff?

19. Zubrowka, Aerial Cable Car

How do they build the world's most expensive cable cars? How is vodka produced from grass? How do social networks connect people around the world?

20. Skydiving Suits, Surströmming Finale

How do skydiving suits work? How do they produce Surströmming, one of the world's smelliest foods? How do they transform weeds into walls?